In Drupal\Core\File\FileSystem::saveData,file_put_contents is called without calling prepareDirectory beforehand. In case the temporary directory does not yet exist, this results in the following error when trying to write a temp file:
Temporary file 'temporary://xxxx' could not be created
1. Set $settings['file_temp_path'] to a folder that does not yet exist (eg. a subfolder of /tmp)
2. Somehow trigger Drupal\Core\File\FileSystem::saveData, eg. by clearing cache and visiting the front page with asset aggregation enabled
Call prepareDirectory before file_put_contents in Drupal\Core\File\FileSystem::saveData.
Write tests.
Needs work
9.5
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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As a bug this will need a test case showing the issue.