pyproject.toml is ignored when passed via stdin

[InSyncWithFoo]

This works:

$ cat pyproject.toml
[project]
name = 1

$ ruff check --isolated --select RUF200 pyproject.toml
pyproject.toml:2:8: RUF200 Failed to parse pyproject.toml: invalid type: integer `1`, expected a string
  |
1 | [project]
2 | name = 1
  |        ^ RUF200
  |

Found 1 error.

This doesn't:

$ ruff check --isolated --select RUF200 --stdin-filename pyproject.toml -
[project]
name = 1
All checks passed!

These two commands should work similarly.

[InSyncWithFoo]

I think the server also doesn't report RUF200 when a pyproject.toml is opened either.

[MichaReiser]

I think the server also doesn't report RUF200 when a pyproject.toml is opened either.

Yes, the server doesn't run on toml files