Error message "fatal: cannot force update the branch 'master' checked out at '/opt/homebrew'" when installing Homebrew

[h2li]

Output of brew config

N/A

Output of brew doctor

N/A

Description of issue

I noticed an error message outputted when installing Homebrew on my MacBook Air with M2 chip (macOS Sonoma 14.3) using /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" in terminal:

fatal: cannot force update the branch 'master' checked out at '/opt/homebrew'

Full output

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" 
==> Checking for `sudo` access (which may request your password)... 
Password: 
==> This script will install: 
/opt/homebrew/bin/brew 
/opt/homebrew/share/doc/homebrew 
/opt/homebrew/share/man/man1/brew.1 
/opt/homebrew/share/zsh/site-functions/_brew 
/opt/homebrew/etc/bash_completion.d/brew 
/opt/homebrew 
==> The following new directories will be created: 
/opt/homebrew/bin 
/opt/homebrew/etc 
/opt/homebrew/include 
/opt/homebrew/lib 
/opt/homebrew/sbin 
/opt/homebrew/share 
/opt/homebrew/var 
/opt/homebrew/opt 
/opt/homebrew/share/zsh 
/opt/homebrew/share/zsh/site-functions 
/opt/homebrew/var/homebrew 
/opt/homebrew/var/homebrew/linked 
/opt/homebrew/Cellar 
/opt/homebrew/Caskroom 
/opt/homebrew/Frameworks 
 
Press RETURN/ENTER to continue or any other key to abort: 
==> /usr/bin/sudo /usr/bin/install -d -o root -g wheel -m 0755 /opt/homebrew 
==> /usr/bin/sudo /bin/mkdir -p /opt/homebrew/bin /opt/homebrew/etc /opt/homebrew/include /opt/homebrew/lib /opt/homebrew/sbin /opt/homebrew/share /opt/homebrew/var /opt/homebrew/opt /opt/homebrew/share/zsh /opt/homebrew/share/zsh/site-functions /opt/homebrew/var/homebrew /opt/homebrew/var/homebrew/linked /opt/homebrew/Cellar /opt/homebrew/Caskroom /opt/homebrew/Frameworks 
==> /usr/bin/sudo /bin/chmod ug=rwx /opt/homebrew/bin /opt/homebrew/etc /opt/homebrew/include /opt/homebrew/lib /opt/homebrew/sbin /opt/homebrew/share /opt/homebrew/var /opt/homebrew/opt /opt/homebrew/share/zsh /opt/homebrew/share/zsh/site-functions /opt/homebrew/var/homebrew /opt/homebrew/var/homebrew/linked /opt/homebrew/Cellar /opt/homebrew/Caskroom /opt/homebrew/Frameworks 
==> /usr/bin/sudo /bin/chmod go-w /opt/homebrew/share/zsh /opt/homebrew/share/zsh/site-functions 
==> /usr/bin/sudo /usr/sbin/chown huihui /opt/homebrew/bin /opt/homebrew/etc /opt/homebrew/include /opt/homebrew/lib /opt/homebrew/sbin /opt/homebrew/share /opt/homebrew/var /opt/homebrew/opt /opt/homebrew/share/zsh /opt/homebrew/share/zsh/site-functions /opt/homebrew/var/homebrew /opt/homebrew/var/homebrew/linked /opt/homebrew/Cellar /opt/homebrew/Caskroom /opt/homebrew/Frameworks 
==> /usr/bin/sudo /usr/bin/chgrp admin /opt/homebrew/bin /opt/homebrew/etc /opt/homebrew/include /opt/homebrew/lib /opt/homebrew/sbin /opt/homebrew/share /opt/homebrew/var /opt/homebrew/opt /opt/homebrew/share/zsh /opt/homebrew/share/zsh/site-functions /opt/homebrew/var/homebrew /opt/homebrew/var/homebrew/linked /opt/homebrew/Cellar /opt/homebrew/Caskroom /opt/homebrew/Frameworks 
==> /usr/bin/sudo /usr/sbin/chown -R huihui:admin /opt/homebrew 
==> /usr/bin/sudo /bin/mkdir -p /Users/huihui/Library/Caches/Homebrew 
==> /usr/bin/sudo /bin/chmod g+rwx /Users/huihui/Library/Caches/Homebrew 
==> /usr/bin/sudo /usr/sbin/chown -R huihui /Users/huihui/Library/Caches/Homebrew 
==> Downloading and installing Homebrew... 
remote: Enumerating objects: 255776, done. 
remote: Counting objects: 100% (486/486), done. 
remote: Compressing objects: 100% (289/289), done. 
remote: Total 255776 (delta 215), reused 434 (delta 172), pack-reused 255290 
Receiving objects: 100% (255776/255776), 74.04 MiB | 2.23 MiB/s, done. 
Resolving deltas: 100% (185430/185430), done. 
From https://github.com/Homebrew/brew 
 * [new branch]          codecov-fix                             -> origin/codecov-fix 
 * [new branch]          deprecation-disable-forks-versions-docs -> origin/deprecation-disable-forks-versions-docs 
 * [new branch]          master                                  -> origin/master 
 * [new tag]             0.1                                     -> 0.1 
 * [new tag]             0.2                                     -> 0.2 
 * [new tag]             0.3                                     -> 0.3 
 * [new tag]             0.4                                     -> 0.4 
 * [new tag]             0.5                                     -> 0.5 
 * [new tag]             0.6                                     -> 0.6 
 * [new tag]             0.7                                     -> 0.7 
 * [new tag]             0.7.1                                   -> 0.7.1 
 * [new tag]             0.8                                     -> 0.8 
 * [new tag]             0.8.1                                   -> 0.8.1 
 * [new tag]             0.9                                     -> 0.9 
 * [new tag]             0.9.1                                   -> 0.9.1 
 * [new tag]             0.9.2                                   -> 0.9.2 
 * [new tag]             0.9.3                                   -> 0.9.3 
 * [new tag]             0.9.4                                   -> 0.9.4 
 * [new tag]             0.9.5                                   -> 0.9.5 
 * [new tag]             0.9.8                                   -> 0.9.8 
 * [new tag]             0.9.9                                   -> 0.9.9 
 * [new tag]             1.0.0                                   -> 1.0.0 
 * [new tag]             1.0.1                                   -> 1.0.1 
 * [new tag]             1.0.2                                   -> 1.0.2 
 * [new tag]             1.0.3                                   -> 1.0.3 
 * [new tag]             1.0.4                                   -> 1.0.4 
 * [new tag]             1.0.5                                   -> 1.0.5 
 * [new tag]             1.0.6                                   -> 1.0.6 
 * [new tag]             1.0.7                                   -> 1.0.7 
 * [new tag]             1.0.8                                   -> 1.0.8 
 * [new tag]             1.0.9                                   -> 1.0.9 
 * [new tag]             1.1.0                                   -> 1.1.0 
 * [new tag]             1.1.1                                   -> 1.1.1 
 * [new tag]             1.1.10                                  -> 1.1.10 
 * [new tag]             1.1.11                                  -> 1.1.11 
 * [new tag]             1.1.12                                  -> 1.1.12 
 * [new tag]             1.1.13                                  -> 1.1.13 
 * [new tag]             1.1.2                                   -> 1.1.2 
 * [new tag]             1.1.3                                   -> 1.1.3 
 * [new tag]             1.1.4                                   -> 1.1.4 
 * [new tag]             1.1.5                                   -> 1.1.5 
 * [new tag]             1.1.6                                   -> 1.1.6 
 * [new tag]             1.1.7                                   -> 1.1.7 
 * [new tag]             1.1.8                                   -> 1.1.8 
 * [new tag]             1.1.9                                   -> 1.1.9 
 * [new tag]             1.2.0                                   -> 1.2.0 
 * [new tag]             1.2.1                                   -> 1.2.1 
 * [new tag]             1.2.2                                   -> 1.2.2 
 * [new tag]             1.2.3                                   -> 1.2.3 
 * [new tag]             1.2.4                                   -> 1.2.4 
 * [new tag]             1.2.5                                   -> 1.2.5 
 * [new tag]             1.2.6                                   -> 1.2.6 
 * [new tag]             1.3.0                                   -> 1.3.0 
 * [new tag]             1.3.1                                   -> 1.3.1 
 * [new tag]             1.3.2                                   -> 1.3.2 
 * [new tag]             1.3.3                                   -> 1.3.3 
 * [new tag]             1.3.4                                   -> 1.3.4 
 * [new tag]             1.3.5                                   -> 1.3.5 
 * [new tag]             1.3.6                                   -> 1.3.6 
 * [new tag]             1.3.7                                   -> 1.3.7 
 * [new tag]             1.3.8                                   -> 1.3.8 
 * [new tag]             1.3.9                                   -> 1.3.9 
 * [new tag]             1.4.0                                   -> 1.4.0 
 * [new tag]             1.4.1                                   -> 1.4.1 
 * [new tag]             1.4.2                                   -> 1.4.2 
 * [new tag]             1.4.3                                   -> 1.4.3 
 * [new tag]             1.5.0                                   -> 1.5.0 
 * [new tag]             1.5.1                                   -> 1.5.1 
 * [new tag]             1.5.10                                  -> 1.5.10 
 * [new tag]             1.5.11                                  -> 1.5.11 
 * [new tag]             1.5.12                                  -> 1.5.12 
 * [new tag]             1.5.13                                  -> 1.5.13 
 * [new tag]             1.5.14                                  -> 1.5.14 
 * [new tag]             1.5.2                                   -> 1.5.2 
 * [new tag]             1.5.3                                   -> 1.5.3 
 * [new tag]             1.5.4                                   -> 1.5.4 
 * [new tag]             1.5.5                                   -> 1.5.5 
 * [new tag]             1.5.6                                   -> 1.5.6 
 * [new tag]             1.5.7                                   -> 1.5.7 
 * [new tag]             1.5.8                                   -> 1.5.8 
 * [new tag]             1.5.9                                   -> 1.5.9 
 * [new tag]             1.6.0                                   -> 1.6.0 
 * [new tag]             1.6.1                                   -> 1.6.1 
 * [new tag]             1.6.10                                  -> 1.6.10 
 * [new tag]             1.6.11                                  -> 1.6.11 
 * [new tag]             1.6.12                                  -> 1.6.12 
 * [new tag]             1.6.13                                  -> 1.6.13 
 * [new tag]             1.6.14                                  -> 1.6.14 
 * [new tag]             1.6.15                                  -> 1.6.15 
 * [new tag]             1.6.16                                  -> 1.6.16 
 * [new tag]             1.6.17                                  -> 1.6.17 
 * [new tag]             1.6.2                                   -> 1.6.2 
 * [new tag]             1.6.3                                   -> 1.6.3 
 * [new tag]             1.6.4                                   -> 1.6.4 
 * [new tag]             1.6.5                                   -> 1.6.5 
 * [new tag]             1.6.6                                   -> 1.6.6 
 * [new tag]             1.6.7                                   -> 1.6.7 
 * [new tag]             1.6.8                                   -> 1.6.8 
 * [new tag]             1.6.9                                   -> 1.6.9 
 * [new tag]             1.7.0                                   -> 1.7.0 
 * [new tag]             1.7.1                                   -> 1.7.1 
 * [new tag]             1.7.2                                   -> 1.7.2 
 * [new tag]             1.7.3                                   -> 1.7.3 
 * [new tag]             1.7.4                                   -> 1.7.4 
 * [new tag]             1.7.5                                   -> 1.7.5 
 * [new tag]             1.7.6                                   -> 1.7.6 
 * [new tag]             1.7.7                                   -> 1.7.7 
 * [new tag]             1.8.0                                   -> 1.8.0 
 * [new tag]             1.8.1                                   -> 1.8.1 
 * [new tag]             1.8.2                                   -> 1.8.2 
 * [new tag]             1.8.3                                   -> 1.8.3 
 * [new tag]             1.8.4                                   -> 1.8.4 
 * [new tag]             1.8.5                                   -> 1.8.5 
 * [new tag]             1.8.6                                   -> 1.8.6 
 * [new tag]             1.9.0                                   -> 1.9.0 
 * [new tag]             1.9.1                                   -> 1.9.1 
 * [new tag]             1.9.2                                   -> 1.9.2 
 * [new tag]             1.9.3                                   -> 1.9.3 
 * [new tag]             2.0.0                                   -> 2.0.0 
 * [new tag]             2.0.1                                   -> 2.0.1 
 * [new tag]             2.0.2                                   -> 2.0.2 
 * [new tag]             2.0.3                                   -> 2.0.3 
 * [new tag]             2.0.4                                   -> 2.0.4 
 * [new tag]             2.0.5                                   -> 2.0.5 
 * [new tag]             2.0.6                                   -> 2.0.6 
 * [new tag]             2.1.0                                   -> 2.1.0 
 * [new tag]             2.1.1                                   -> 2.1.1 
 * [new tag]             2.1.10                                  -> 2.1.10 
 * [new tag]             2.1.11                                  -> 2.1.11 
 * [new tag]             2.1.12                                  -> 2.1.12 
 * [new tag]             2.1.13                                  -> 2.1.13 
 * [new tag]             2.1.14                                  -> 2.1.14 
 * [new tag]             2.1.15                                  -> 2.1.15 
 * [new tag]             2.1.16                                  -> 2.1.16 
 * [new tag]             2.1.2                                   -> 2.1.2 
 * [new tag]             2.1.3                                   -> 2.1.3 
 * [new tag]             2.1.4                                   -> 2.1.4 
 * [new tag]             2.1.5                                   -> 2.1.5 
 * [new tag]             2.1.6                                   -> 2.1.6 
 * [new tag]             2.1.7                                   -> 2.1.7 
 * [new tag]             2.1.8                                   -> 2.1.8 
 * [new tag]             2.1.9                                   -> 2.1.9 
 * [new tag]             2.2.0                                   -> 2.2.0 
 * [new tag]             2.2.1                                   -> 2.2.1 
 * [new tag]             2.2.10                                  -> 2.2.10 
 * [new tag]             2.2.11                                  -> 2.2.11 
 * [new tag]             2.2.12                                  -> 2.2.12 
 * [new tag]             2.2.13                                  -> 2.2.13 
 * [new tag]             2.2.14                                  -> 2.2.14 
 * [new tag]             2.2.15                                  -> 2.2.15 
 * [new tag]             2.2.16                                  -> 2.2.16 
 * [new tag]             2.2.17                                  -> 2.2.17 
 * [new tag]             2.2.2                                   -> 2.2.2 
 * [new tag]             2.2.3                                   -> 2.2.3 
 * [new tag]             2.2.4                                   -> 2.2.4 
 * [new tag]             2.2.5                                   -> 2.2.5 
 * [new tag]             2.2.6                                   -> 2.2.6 
 * [new tag]             2.2.7                                   -> 2.2.7 
 * [new tag]             2.2.8                                   -> 2.2.8 
 * [new tag]             2.2.9                                   -> 2.2.9 
 * [new tag]             2.3.0                                   -> 2.3.0 
 * [new tag]             2.4.0                                   -> 2.4.0 
 * [new tag]             2.4.1                                   -> 2.4.1 
 * [new tag]             2.4.10                                  -> 2.4.10 
 * [new tag]             2.4.11                                  -> 2.4.11 
 * [new tag]             2.4.12                                  -> 2.4.12 
 * [new tag]             2.4.13                                  -> 2.4.13 
 * [new tag]             2.4.14                                  -> 2.4.14 
 * [new tag]             2.4.15                                  -> 2.4.15 
 * [new tag]             2.4.16                                  -> 2.4.16 
 * [new tag]             2.4.2                                   -> 2.4.2 
 * [new tag]             2.4.3                                   -> 2.4.3 
 * [new tag]             2.4.4                                   -> 2.4.4 
 * [new tag]             2.4.5                                   -> 2.4.5 
 * [new tag]             2.4.6                                   -> 2.4.6 
 * [new tag]             2.4.7                                   -> 2.4.7 
 * [new tag]             2.4.8                                   -> 2.4.8 
 * [new tag]             2.4.9                                   -> 2.4.9 
 * [new tag]             2.5.0                                   -> 2.5.0 
 * [new tag]             2.5.1                                   -> 2.5.1 
 * [new tag]             2.5.10                                  -> 2.5.10 
 * [new tag]             2.5.11                                  -> 2.5.11 
 * [new tag]             2.5.12                                  -> 2.5.12 
 * [new tag]             2.5.2                                   -> 2.5.2 
 * [new tag]             2.5.3                                   -> 2.5.3 
 * [new tag]             2.5.4                                   -> 2.5.4 
 * [new tag]             2.5.5                                   -> 2.5.5 
 * [new tag]             2.5.6                                   -> 2.5.6 
 * [new tag]             2.5.7                                   -> 2.5.7 
 * [new tag]             2.5.8                                   -> 2.5.8 
 * [new tag]             2.5.9                                   -> 2.5.9 
 * [new tag]             2.6.0                                   -> 2.6.0 
 * [new tag]             2.6.1                                   -> 2.6.1 
 * [new tag]             2.6.2                                   -> 2.6.2 
 * [new tag]             2.7.0                                   -> 2.7.0 
 * [new tag]             2.7.1                                   -> 2.7.1 
 * [new tag]             2.7.2                                   -> 2.7.2 
 * [new tag]             2.7.3                                   -> 2.7.3 
 * [new tag]             2.7.4                                   -> 2.7.4 
 * [new tag]             2.7.5                                   -> 2.7.5 
 * [new tag]             2.7.6                                   -> 2.7.6 
 * [new tag]             2.7.7                                   -> 2.7.7 
 * [new tag]             3.0.0                                   -> 3.0.0 
 * [new tag]             3.0.1                                   -> 3.0.1 
 * [new tag]             3.0.10                                  -> 3.0.10 
 * [new tag]             3.0.11                                  -> 3.0.11 
 * [new tag]             3.0.2                                   -> 3.0.2 
 * [new tag]             3.0.3                                   -> 3.0.3 
 * [new tag]             3.0.4                                   -> 3.0.4 
 * [new tag]             3.0.5                                   -> 3.0.5 
 * [new tag]             3.0.6                                   -> 3.0.6 
 * [new tag]             3.0.7                                   -> 3.0.7 
 * [new tag]             3.0.8                                   -> 3.0.8 
 * [new tag]             3.0.9                                   -> 3.0.9 
 * [new tag]             3.1.0                                   -> 3.1.0 
 * [new tag]             3.1.1                                   -> 3.1.1 
 * [new tag]             3.1.10                                  -> 3.1.10 
 * [new tag]             3.1.11                                  -> 3.1.11 
 * [new tag]             3.1.12                                  -> 3.1.12 
 * [new tag]             3.1.2                                   -> 3.1.2 
 * [new tag]             3.1.3                                   -> 3.1.3 
 * [new tag]             3.1.4                                   -> 3.1.4 
 * [new tag]             3.1.5                                   -> 3.1.5 
 * [new tag]             3.1.6                                   -> 3.1.6 
 * [new tag]             3.1.7                                   -> 3.1.7 
 * [new tag]             3.1.8                                   -> 3.1.8 
 * [new tag]             3.1.9                                   -> 3.1.9 
 * [new tag]             3.2.0                                   -> 3.2.0 
 * [new tag]             3.2.1                                   -> 3.2.1 
 * [new tag]             3.2.10                                  -> 3.2.10 
 * [new tag]             3.2.11                                  -> 3.2.11 
 * [new tag]             3.2.12                                  -> 3.2.12 
 * [new tag]             3.2.13                                  -> 3.2.13 
 * [new tag]             3.2.14                                  -> 3.2.14 
 * [new tag]             3.2.15                                  -> 3.2.15 
 * [new tag]             3.2.16                                  -> 3.2.16 
 * [new tag]             3.2.17                                  -> 3.2.17 
 * [new tag]             3.2.2                                   -> 3.2.2 
 * [new tag]             3.2.3                                   -> 3.2.3 
 * [new tag]             3.2.4                                   -> 3.2.4 
 * [new tag]             3.2.5                                   -> 3.2.5 
 * [new tag]             3.2.6                                   -> 3.2.6 
 * [new tag]             3.2.7                                   -> 3.2.7 
 * [new tag]             3.2.8                                   -> 3.2.8 
 * [new tag]             3.2.9                                   -> 3.2.9 
 * [new tag]             3.3.0                                   -> 3.3.0 
 * [new tag]             3.3.1                                   -> 3.3.1 
 * [new tag]             3.3.10                                  -> 3.3.10 
 * [new tag]             3.3.11                                  -> 3.3.11 
 * [new tag]             3.3.12                                  -> 3.3.12 
 * [new tag]             3.3.13                                  -> 3.3.13 
 * [new tag]             3.3.14                                  -> 3.3.14 
 * [new tag]             3.3.15                                  -> 3.3.15 
 * [new tag]             3.3.16                                  -> 3.3.16 
 * [new tag]             3.3.2                                   -> 3.3.2 
 * [new tag]             3.3.3                                   -> 3.3.3 
 * [new tag]             3.3.4                                   -> 3.3.4 
 * [new tag]             3.3.5                                   -> 3.3.5 
 * [new tag]             3.3.6                                   -> 3.3.6 
 * [new tag]             3.3.7                                   -> 3.3.7 
 * [new tag]             3.3.8                                   -> 3.3.8 
 * [new tag]             3.3.9                                   -> 3.3.9 
 * [new tag]             3.4.0                                   -> 3.4.0 
 * [new tag]             3.4.1                                   -> 3.4.1 
 * [new tag]             3.4.10                                  -> 3.4.10 
 * [new tag]             3.4.11                                  -> 3.4.11 
 * [new tag]             3.4.2                                   -> 3.4.2 
 * [new tag]             3.4.3                                   -> 3.4.3 
 * [new tag]             3.4.4                                   -> 3.4.4 
 * [new tag]             3.4.5                                   -> 3.4.5 
 * [new tag]             3.4.6                                   -> 3.4.6 
 * [new tag]             3.4.7                                   -> 3.4.7 
 * [new tag]             3.4.8                                   -> 3.4.8 
 * [new tag]             3.4.9                                   -> 3.4.9 
 * [new tag]             3.5.0                                   -> 3.5.0 
 * [new tag]             3.5.1                                   -> 3.5.1 
 * [new tag]             3.5.10                                  -> 3.5.10 
 * [new tag]             3.5.2                                   -> 3.5.2 
 * [new tag]             3.5.3                                   -> 3.5.3 
 * [new tag]             3.5.4                                   -> 3.5.4 
 * [new tag]             3.5.5                                   -> 3.5.5 
 * [new tag]             3.5.6                                   -> 3.5.6 
 * [new tag]             3.5.7                                   -> 3.5.7 
 * [new tag]             3.5.8                                   -> 3.5.8 
 * [new tag]             3.5.9                                   -> 3.5.9 
 * [new tag]             3.6.0                                   -> 3.6.0 
 * [new tag]             3.6.1                                   -> 3.6.1 
 * [new tag]             3.6.10                                  -> 3.6.10 
 * [new tag]             3.6.11                                  -> 3.6.11 
 * [new tag]             3.6.12                                  -> 3.6.12 
 * [new tag]             3.6.13                                  -> 3.6.13 
 * [new tag]             3.6.14                                  -> 3.6.14 
 * [new tag]             3.6.15                                  -> 3.6.15 
 * [new tag]             3.6.16                                  -> 3.6.16 
 * [new tag]             3.6.17                                  -> 3.6.17 
 * [new tag]             3.6.18                                  -> 3.6.18 
 * [new tag]             3.6.19                                  -> 3.6.19 
 * [new tag]             3.6.2                                   -> 3.6.2 
 * [new tag]             3.6.20                                  -> 3.6.20 
 * [new tag]             3.6.21                                  -> 3.6.21 
 * [new tag]             3.6.3                                   -> 3.6.3 
 * [new tag]             3.6.4                                   -> 3.6.4 
 * [new tag]             3.6.5                                   -> 3.6.5 
 * [new tag]             3.6.6                                   -> 3.6.6 
 * [new tag]             3.6.7                                   -> 3.6.7 
 * [new tag]             3.6.8                                   -> 3.6.8 
 * [new tag]             3.6.9                                   -> 3.6.9 
 * [new tag]             4.0.0                                   -> 4.0.0 
 * [new tag]             4.0.1                                   -> 4.0.1 
 * [new tag]             4.0.10                                  -> 4.0.10 
 * [new tag]             4.0.11                                  -> 4.0.11 
 * [new tag]             4.0.12                                  -> 4.0.12 
 * [new tag]             4.0.13                                  -> 4.0.13 
 * [new tag]             4.0.14                                  -> 4.0.14 
 * [new tag]             4.0.15                                  -> 4.0.15 
 * [new tag]             4.0.16                                  -> 4.0.16 
 * [new tag]             4.0.17                                  -> 4.0.17 
 * [new tag]             4.0.18                                  -> 4.0.18 
 * [new tag]             4.0.19                                  -> 4.0.19 
 * [new tag]             4.0.2                                   -> 4.0.2 
 * [new tag]             4.0.20                                  -> 4.0.20 
 * [new tag]             4.0.21                                  -> 4.0.21 
 * [new tag]             4.0.22                                  -> 4.0.22 
 * [new tag]             4.0.23                                  -> 4.0.23 
 * [new tag]             4.0.24                                  -> 4.0.24 
 * [new tag]             4.0.25                                  -> 4.0.25 
 * [new tag]             4.0.26                                  -> 4.0.26 
 * [new tag]             4.0.27                                  -> 4.0.27 
 * [new tag]             4.0.28                                  -> 4.0.28 
 * [new tag]             4.0.3                                   -> 4.0.3 
 * [new tag]             4.0.4                                   -> 4.0.4 
 * [new tag]             4.0.5                                   -> 4.0.5 
 * [new tag]             4.0.6                                   -> 4.0.6 
 * [new tag]             4.0.7                                   -> 4.0.7 
 * [new tag]             4.0.8                                   -> 4.0.8 
 * [new tag]             4.0.9                                   -> 4.0.9 
 * [new tag]             4.1.0                                   -> 4.1.0 
 * [new tag]             4.1.1                                   -> 4.1.1 
 * [new tag]             4.1.10                                  -> 4.1.10 
 * [new tag]             4.1.11                                  -> 4.1.11 
 * [new tag]             4.1.12                                  -> 4.1.12 
 * [new tag]             4.1.13                                  -> 4.1.13 
 * [new tag]             4.1.14                                  -> 4.1.14 
 * [new tag]             4.1.15                                  -> 4.1.15 
 * [new tag]             4.1.16                                  -> 4.1.16 
 * [new tag]             4.1.17                                  -> 4.1.17 
 * [new tag]             4.1.18                                  -> 4.1.18 
 * [new tag]             4.1.19                                  -> 4.1.19 
 * [new tag]             4.1.2                                   -> 4.1.2 
 * [new tag]             4.1.20                                  -> 4.1.20 
 * [new tag]             4.1.21                                  -> 4.1.21 
 * [new tag]             4.1.22                                  -> 4.1.22 
 * [new tag]             4.1.23                                  -> 4.1.23 
 * [new tag]             4.1.24                                  -> 4.1.24 
 * [new tag]             4.1.25                                  -> 4.1.25 
 * [new tag]             4.1.3                                   -> 4.1.3 
 * [new tag]             4.1.4                                   -> 4.1.4 
 * [new tag]             4.1.5                                   -> 4.1.5 
 * [new tag]             4.1.6                                   -> 4.1.6 
 * [new tag]             4.1.7                                   -> 4.1.7 
 * [new tag]             4.1.8                                   -> 4.1.8 
 * [new tag]             4.2.0                                   -> 4.2.0 
 * [new tag]             4.2.1                                   -> 4.2.1 
 * [new tag]             4.2.2                                   -> 4.2.2 
 * [new tag]             4.2.3                                   -> 4.2.3 
 * [new tag]             4.2.4                                   -> 4.2.4 
 * [new tag]             4.2.5                                   -> 4.2.5 
 * [new tag]             4.2.6                                   -> 4.2.6 
 * [new tag]             4.2.7                                   -> 4.2.7 
remote: Enumerating objects: 18, done. 
remote: Counting objects: 100% (11/11), done. 
remote: Total 18 (delta 11), reused 11 (delta 11), pack-reused 7 
Unpacking objects: 100% (18/18), 3.38 KiB | 216.00 KiB/s, done. 
From https://github.com/Homebrew/brew 
 * [new tag]             4.0.29     -> 4.0.29 
 * [new tag]             4.1.9      -> 4.1.9 
HEAD is now at a92591108 Merge pull request #16618 from Homebrew/dependabot/bundler/Library/Homebrew/sorbet-runtime-and-sorbet-static-and-runtime-0.5.11237 
fatal: cannot force update the branch 'master' checked out at '/opt/homebrew' 
==> Downloading https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:d783cbeb6e6ef0d71c0b442317b54554370decd6fac66bf2d4938c07a63f67be 
########################################################################################################################## 100.0%
==> Pouring portable-ruby-3.1.4.arm64_big_sur.bottle.tar.gz 
Warning: /opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the 'Next steps' section below. 
==> Installation successful! 
 
==> Homebrew has enabled anonymous aggregate formulae and cask analytics. 
Read the analytics documentation (and how to opt-out) here: 
  https://docs.brew.sh/Analytics 
No analytics data has been sent yet (nor will any be during this install run). 
 
==> Homebrew is run entirely by unpaid volunteers. Please consider donating: 
  https://github.com/Homebrew/brew#donations 
 
==> Next steps: 
- Run these two commands in your terminal to add Homebrew to your PATH: 
    (echo; echo 'eval "$(/opt/homebrew/bin/brew shellenv)"') >> /Users/huihui/.zprofile 
    eval "$(/opt/homebrew/bin/brew shellenv)" 
- Run brew help to get started 
- Further documentation: 
    https://docs.brew.sh 

This error message occurred when the installation script was executing /opt/homebrew/bin/brew update --force --quiet after /usr/bin/git reset --hard origin/master (I tried to run the installation script with the -x option).

Part of the output with each command executed

Install Homebrew with command /bin/bash -c -x "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

+ execute /usr/bin/git fetch --force --tags origin 
+ /usr/bin/git fetch --force --tags origin 
remote: Enumerating objects: 18, done. 
remote: Counting objects: 100% (11/11), done. 
remote: Total 18 (delta 11), reused 11 (delta 11), pack-reused 7 
Unpacking objects: 100% (18/18), 3.38 KiB | 203.00 KiB/s, done. 
From https://github.com/Homebrew/brew 
 * [new tag]             4.0.29     -> 4.0.29 
 * [new tag]             4.1.9      -> 4.1.9 
+ execute /usr/bin/git reset --hard origin/master 
+ /usr/bin/git reset --hard origin/master 
HEAD is now at a92591108 Merge pull request #16618 from Homebrew/dependabot/bundler/Library/Homebrew/sorbet-runtime-and-sorbet-static-and-runtime-0.5.11237 
+ [[ /opt/homebrew != \/\o\p\t\/\h\o\m\e\b\r\e\w ]] 
+ [[ -n '' ]] 
+ execute /opt/homebrew/bin/brew update --force --quiet 
+ /opt/homebrew/bin/brew update --force --quiet 
fatal: cannot force update the branch 'master' checked out at '/opt/homebrew' 
==> Downloading https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:d783cbeb6e6ef0d71c0b442317b54554370decd6fac66bf2d4938c07a63f67be 
########################################################################################################################## 100.0%
==> Pouring portable-ruby-3.1.4.arm64_big_sur.bottle.tar.gz 
+ [[ :/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin: != *\:\/\o\p\t\/\h\o\m\e\b\r\e\w\/\b\i\n\:* ]] 
+ warn '/opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the '\''Next steps'\'' section below.' 
++ chomp '/opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the '\''Next steps'\'' section below.' 
++ printf %s '/opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the '\''Next steps'\'' section below.' 
+ printf 'Warning: %s\n' '/opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the '\''Next steps'\'' section below.' 
Warning: /opt/homebrew/bin is not in your PATH. 
  Instructions on how to configure your shell for Homebrew 
  can be found in the 'Next steps' section below. 
+ ohai 'Installation successful!' 
++ shell_join 'Installation successful!' 
++ local arg 
++ printf %s 'Installation successful!' 
++ shift 
+ printf '==> %s\n' 'Installation successful!' 
==> Installation successful! 

Although it ultimately reported successful installation, I'm wondering why this error occurred and whether it will impact Homebrew's functionality.

[SMillerDev]

If brew doctor does not return anything you have nothing to worry about.

[briankelly]

Just wanted to add that I ran into this same error, but I installed the 4.2.7 release from the .pkg file on a fresh M3 Mac running Sonoma 14.3.1.

After I completed the package install, I ran /opt/homebrew/bin/brew shellenv and I added the output to my .zshrc file. Upon opening a new terminal, I ran brew and here's what the output looked like.

First run of brew

% brew
==> Downloading https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:d783cbeb6e6ef0d71c0b442317b54554370decd6fac66bf2d4938c07a63f67be
############################################################################################################################################################################## 100.0%
==> Pouring portable-ruby-3.1.4.arm64_big_sur.bottle.tar.gz
Example usage:
  brew search TEXT|/REGEX/
  brew info [FORMULA|CASK...]
  brew install FORMULA|CASK...
  brew update
  brew upgrade [FORMULA|CASK...]
  brew uninstall FORMULA|CASK...
  brew list [FORMULA|CASK...]

Troubleshooting:
  brew config
  brew doctor
  brew install --verbose --debug FORMULA|CASK

Contributing:
  brew create URL [--no-fetch]
  brew edit [FORMULA|CASK...]

Further help:
  brew commands
  brew help [COMMAND]
  man brew
  https://docs.brew.sh

No errors there. But upon running brew update I got the same error as OP:

% brew update
fatal: cannot force update the branch 'master' checked out at '/opt/homebrew'
[..]

Full output from first run of brew update

% brew update
fatal: cannot force update the branch 'master' checked out at '/opt/homebrew'
==> Homebrew collects anonymous analytics.
Read the analytics documentation (and how to opt-out) here:
  https://docs.brew.sh/Analytics
No analytics have been recorded yet (nor will be during this `brew` run).

==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations

Updated 2 taps (homebrew/core and homebrew/cask).
==> New Formulae
autobrr                             cekit                               ignite                              kubetui                             magic-wormhole.rs
==> New Casks
hancom-docs

Since brew doctor did not produce any errors I guess I'm okay? ¯\(ツ)/¯

% brew doctor && brew --version
Your system is ready to brew.
Homebrew 4.2.7

[dkav]

I believe this may be resolved now. See Homebrew/install#847 for more info.