Why Citadels always count as "Map Failed" theory

When you complete a citadel for a lot of us game still count it as Failed Map.

My theory is that Boss in each citadel doesn't updated correctly as a monster but count as 2 monsters because each boss is a copy of a campaign boss that has 2 phases.

Why this?

Well if you have Atlas unlock "Deadly Evolution" which grants rare and unique monsters extra modifiers , on phase switches this modifiers change actually.

So game "thinks" in 1st phase is 1 monster remaining but when it switches to 2nd phase it overwrites the kill and it still "thinks" or update as 1 monster, thus because of phase switch kill is never recorded and map can't be completed.

[Removed by Support]

It's not because Deadly Evolution, having that just showcase that modifiers change from phase 1 to phase 2 , which shouldn't happen because boss monster is same monster.

But game doesn't register it as such and counts each phase as 2 different monsters.

Please try to read before saying stuff that are meaningless.