Steps to reproduce:

1. Add a second language via UI and configure the language in ibexa_admin_ui.yaml.
2. Create a landing page in English and add German as a second language.
3. Create a migration file for this landing page using --siteaccess=admin.
4. Remove the newly created landing page,
5. Execute the migration.
6. Edit the English version of the migrated content and save it without change.
7. Use the version compare function:
   1. Select version 1 in English on the left hand side.
   2. Select version 2 in English on the right hand side.
   3. Select "German" in language switcher at the top right (see screenshot for full setup).

Expected result:
A proper comparison page is shown.

Actual result:
An exception is thrown:

Symfony\Component\HttpKernel\Exception\NotFoundHttpException