Advanced permission rule dialog broken (cant add users)

Since the update to 19.04 the advanced permission rule dialog is broken. When creating a new rule the user list is generated incompletely (about 10% of all users). The search field does not work, it does not find any users (no matter if they are in the partially generated list or not).

Is there a kind of cache for the users in the app, which I can rebuild?

Furthermore this problem still exists:

I am grateful for every hint.

same here… we’d be grateful for any hint on your configuration, setup, server environment etc…

sorry! i forgot…

This nextcloud runs on a univention server as a docker app. Usermanagement happens via LDAP. I can search trough all users in all other cases (sharing, contacts etc.), so i thought the problem is somewhere in the groupfolders app…