Admin won't switch to German

I have Mautic running with my own Docker setup.

Today, I had to restart it, and it switched to version 7.1.1. I thought that was it.
After a migration and schema update, as well as running cache:clear multiple times, I can change whatever settings I want, but it doesn’t accept the language change.

In the user account, it always remains on System Standard, and while System Standard is set to German, the admin interface is still in English.

Has anyone else experienced this? It doesn’t necessarily have to be related to Docker.

I have experienced this.

Clearing cache + login in / out helped me.

I was able to solve it by migrating my Docker stack from the Mautic image to my own custom stack.
Now it works!

The official Mautic stack turned out to be too “imprecise” for me, and I’m getting better results with my own setup.