I've tried to create a User with a specific Role and a Readonly Group. Then I've changed the permissions for all Users in a project to a different role. When I try to switch to my group now I get the following exception - and I'm not quite sure what to do with it:
java.lang.IllegalStateException: 'PersistentEvent.added_permittedUser' can contain only 'DeletedUser' types. 'User' type is not supported.