Themes Broken: <link rel="stylesheet" media="all" href="/" />

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Comment 8 days ago →
🇮🇳India mohit_aghera Rajkot
I tried to reproduce the issue while doing triage for Bug smash initiative.

Thanks to @rcodina and @dieterholvoet for providing hints about the project.
It seems to be happening when file_temp_path setting isn't correct one.

Since this issue happens due to missing $settings['file_temp_path'] setting,
I added following config in the settings.php file.
$settings['file_temp_path'] = '/abc';
This directory doesn't exist at all inside my docker container and system is not able to create it either.

After doing cache clear, I was able to see the theme properly.
I noticed following message on the screen which were able to convey that file_temp_path is incorrect.

Notice: tempnam(): file created in the system's temporary directory in Drupal\Core\File\FileSystem->tempnam() (line 274 of core/lib/Drupal/Core/File/FileSystem.php). Warning: file_put_contents(temporary://filebNGCln): Failed to open stream: "Drupal\Core\StreamWrapper\TemporaryStream::stream_open" call failed in Drupal\Core\File\FileSystem->saveData() (line 498 of core/lib/Drupal/Core/File/FileSystem.php).
When we don't have the settings $settings['file_temp_path'] = '/abc'; in settings.php, it falls back to `/tmp` directory of the OS.
In the following snippet, we can see that if settings is empty, Drupal will pick the operating system's tmp directory.
https://git.drupalcode.org/project/drupal/-/blob/11.x/core/lib/Drupal/Co...

I think we would need more detailed steps to reproduce the issue.