Since 1.14.20 hotfix update, every villager will go out of their bed to start a new day, but Nitwits villagers won't stand up immediatly compared to other type of villagers.

Proof: there's one screenshot to show a large (unfinished) room with alot of villagers sleeping during night time, the other screenshot shows how every villager will react at day time (2 Nitwits still sleeping).

So I'm wondering. It is a bug or it is a feature that works as intended?