Symfony version(s) affected: 4.3.5

Description
Cache is not invalidated when you add a new path to translations to config/packages/translation.yaml

How to reproduce

Have a following content in config/packages/translation.yaml:

framework:
    default_locale: cs
    translator:
        paths:
            - '%kernel.project_dir%/src/App/translations'

Add a new path to config/packages/translation.yaml, so it looks like this:

framework:
    default_locale: cs
    translator:
        paths:
            - '%kernel.project_dir%/src/App/translations'
            - '%kernel.project_dir%/src/Admin/translations'

• Create messages.cs.yaml file in %kernel.project_dir%/src/Admin/translations
• refresh the page

Expected result:
Translations are loaded automatically.

Actual result:
Translations are not loaded until the cache is manually cleared (e.g. by removing var/cache/dev/translations dir from the filesystem).

Documentation:

New in version 4.3: Starting from Symfony 4.3, when you create a new translation file (or install a bundle that includes translation files), you don't have to clear the cache with the command php bin/console cache:clear as you had to do in previous Symfony versions.

Related issues:

• Recompile container when translations directory changes #32708