New discussion template does not always format post content to html

[ctml91]

Bug Report

Current Behavior
Sometimes a new discussion email has not html formatting applied for the post content. The behaviour is sometimes observed by submitting a lengthy post consisting of various elements such as code blocks, headers, links. Although I cannot track down what the condition is that is causing it.

For testing, I tagged a second user in the post so that the mentions template would get used. The user received two emails, one for the mention and one for tag subscription. The new discussion email was not formatted properly, while the user mentioned email was.

Environment

• Flarum version: beta 15
• PHP version: 7.4

Output of "php flarum info", run this in terminal in your Flarum directory.