civicrm_og_sync in recent version doesn't properly sync og admins to civi acl group

First some info about my setup:

Drupal 7.34
OG 7.x-2.7
CiviCRM 4.5.6 (was 4.5.5 on install)

I'm relatively new to CiviCRM so I first thought, that would be a new feature and posted it in the forum:
http://forum.civicrm.org/index.php/topic,35711.0.html

It turned out that syncing og admins to the corresponding ACL group was working in older releases but seems to be broken since civicrm_og_sync supports og-7.x-2.x.

The problem in short:
Only og group node author(s) are added to the CiviCRM ACL group.
Og admins that are not group node author never get added.

My suggestion ist to use og_user_access_entity() for the check, whether a member is admin or not.
I can provide more code snippets if necessary.