It seems changes in Products.PlonePAS 5.1.0 and 5.1.1 were not added to new Products.PlonePAS releases (6.0.x).
Changelog for older versions
5.1.1 (2019-05-21)
Bug fixes:
- old-style exception fixed in groupdata.py (#44)
5.1.0 (2018-05-01)
New features:
- Notify PropertiesUpdated event when member properties are changed [ezvirtual]