Duplicated groups connected to courses cannot be accessed by regular course owners w/o admin rights from within the member management

Users without admin rights that are added as owners to courses w/o specific group rights, are not able to open any groups that have previously been duplicated in either the course member management or the group management tab.

It seems that the duplication process omits or eliminates some kind of access rights.

How to reproduce:

• create a course with at least one group
• add another user w/o admin rights, preferably author rights as owner
• user should have admin access to all integrated groups
• as admin, duplicate one of the integrated groups from within the member management
  --> other user should not be able to open group
• as admin, duplicate one of the groups from within the group tabs
  --> other user should not be able to open group