Setting a category to "Require moderator approval of all new topics" does not work

Hey, i am Admin and try to set a category to “Require moderator approval of all new topics”
But whenever I save the new setting, it is not executed / the checkmarks have disappeared when I open the category settings again.

This happens in a Category and also in Subcategories

Discourse and all plugins are up to date to the latest version.

Thanks for your help

Update, strangely the function seems to be enabled, so new posts actually go to moderator approval, but still in the category setting it shows as “unchecked / unactivated”