Slug translation problem

Hello,

I am facing the problem that the list and day view lead to a 404 page. Which is because the slug has been translated to our site language (German). The month view is the default view and works fine.

List view: https://www.mydomain.de/events/liste/ (404 page)
Day view: https://www.mydomain.de/events/heute/ (404 page)

If I rewrite the URL manually to english slugs, I get the correct view.

https://www.mydomain.de/events/list/ (is working)
https://www.mydomain.de/events/today/ (is working)

How can I fix it? We do not use WPML or any other translation plugin. Flushing permalinks didn’t help either.

I’d be grateful for any help.

Manuel