Given :
{{ directory }} variable is used in the e-mail template (for example to generate absolute paths to images)The active theme can't be fully overriden (for example using \Drupal::theme()->setActiveTheme()) because :
\Drupal\file\Element\ManagedFile::processManagedFile() load the list of files during the page load before form submission$variables['directory'] is statically cached during the page load by _template_preprocess_default_variables() (through the template_preprocess() function)So the {{ directory }} variable in the final rendering get the path from the theme of the form, not from the override. It doesn't reflect the actually active theme, this variable is not reliable.
We don't get this behavior if the managed file field is empty, because the list of links is empty so not rendered.
Initialize $variables['directory'] as empty in template_preprocess() and set it to the active theme out of the template_preprocess() scope (for example in \Drupal\Core\Theme\ThemeManager::render() where $variables['directory'] is used as a flag) .
To be determined.
No user interface change to expect.
No API change to expect.
No data model change to expect.
Postponed: needs info
11.0 🔥
file system
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Came up as a daily BSI target
Not sure I follow, which template_preprocess are you referring to?
Also can we see if the related issue 🐛 {{ directory }} in Twig template resolves the directory of the child theme rather than that of the parent theme Active is also addressing this.