Map bosses drop bugged?

It looks like only one boss actually drops the final map boss rewards (synth, conqueror, elder, shaper, and normal map drops) in maps that have "Area Contains Two Unique Bosses" or maps with more than 1 boss, even maps witnessed by Maven (with Destructive Play).

It was always like this, or is not working as intended?

Final boss is considered the last boss in a map. Destructive Play applies Final boss modifiers to the Maven summoned bosses, not the natural or twinned bosses. Otherwise it would incentivize people to only run maps with extra bosses or roll for twinned.

There is still the small benefit where unique monsters can drop better loot or works with the unique mobs increased chance to drop scarabs. I've done a few twinned City Squares and left with extra scarabs. But no atlas boosting them to my knowledge.

That is interesting, for some reason I thought that bosses from maps like City Square dropped final boss loot too on previously leagues.

Thanks for the clarification :)