Group Merges

I’m having trouble getting group merges functioning in a way that I’d expect.
Maybe the group merge is like a cuelist merge where the fixtures from the source need to also be in the destination to populate the events of the cuelists of the source that have been merged.
I’ve tried just about every combination and just about every order of merge, but I keep getting the same result of the groups being emptied of fixtures and with a green check mark on the group icon on the destination side once merged.
Please tell me what I’m doing wrong and how this should be performed.

Related to this question, layouts seem to merge no problem.

i’ve encounterd this problem too just know and i think its a bug.
but not sure.