Looks like a duplicate of ITS#6663, which was fixed in OpenLDAP 2.4.24.
Re: (ITS#7171) RefInt overlay: olcRefIntNothing doesn't kick in when deleting last member from group
- (ITS#7171) RefInt overlay: olcRefIntNothing doesn't kick ... p . nijs
- Re: (ITS#7171) RefInt overlay: olcRefIntNothing does... h . b . furuseth
