metacontact icon
When you create a metacontact where the main contact is in multiple groups, the expand/collapse icon used for the main contact in other groups is always the same as the one in which you created the metacontact. Yes, this is unclear.
Basically:
Group A
Contact B
Contact C
Group D
Contact B
Contact C
Now drag Contact C in group A to be a child of contact B in group A. The expand/collapse icon for contact B in Group D will change depending as you click on contact B in group A.