Good morning @texnixe,
I did the tests you recommended.
- Upgrading the template to 3.5.3.1 breaks the page
if ($template->exists() === false) { throw new NotFoundException([ 'key' => 'template.default.notFound' ]); } - I installed the starterkit and used the language-configuration as described in the tutorial. This works fine. The English url displays the page in English, the German url displays German.
Where can I find the exact version of Kirby? This seems to differ from version to version.
Looking for @aristotheme in the forum I found this:
Might this be all related?