SSE, ItemStateChangedEvent for GroupItems

Can anyone shed some light on the OH2 handling of the events for the group Item.

What I see with the HABpanel UI is that when a member of the group is changed, the notification for the group is not being sent. So the group switch will not get the proper status.

That works fine in the Basic UI, but I understand that it does that some other way,

TIA
Maciej