Annoying bug in user management

Nextcloud v 11.0.1

Hello, Admin creates a group and makes a user the group-admin of this group. User can create new users for this group, but: when clicking on settings in the left lower corner and choosing on of the options (e.g. Show e-mail-addresses), the System warns: “Problem on loading the page”, makes a refresh in 5 seconds, and the column for e-mails does not appear.

I found a Workaround: Only if the Admin is activating all the options under settings, it will work for the sub-admin as well.

Cheers, Hans