https://en.wikipedia.org/wiki/Flag_of_Yugoslavia
https://en.wikipedia.org/wiki/Flag_of_Serbia_and_Montenegro

I always knew that the concept of Yugoslavia (as a historical area in MusicBrainz) included the period known as the Federal Republic of Yugoslavia (1992-2003) alongside its predecessors until I saw the following edits:

edit #121547530
edit #121547555

This changes the meaning of the aforementioned FRY (in terms of MB areas) from a continuation of Yugoslavia to just the former name of what later became known as the country of Serbia and Montenegro.

To reflect this change, I'd argue that the flag icon for Yugoslavia needs updating too. Although the blue-white-red plain tricolor was used originally when Yugoslavia was constituted as a kingdom, the one with the communist red star  was used for much longer, up until the country's dissolution in the early 90's.