Nitwits have the same schedule as the unemployed, meaning they get up at the same time as other villagers, they gather around bells, and return home a short time before sunset instead of after sunset.
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The only negative side effect I see from this is that the current time for the Villagers to pathfind to their Beds is preciscely fine, as it gives them a very flexible timespan to go to sleep before the Mobs start spawning even to those that are far away from their Beds hours before sunset.
In this case Nitwits are very know for wander far away from the Village boundaries, but if they implement this in a more unique way just like in Bedrock that they head towards their Home just moments after the other regular villagers do, and stay here inside the House it can definitely work, because currently in Bedrock they rest very late, you can see a lot of Mobs already spawned but the big advantage and difference is that here they head to their Homes not directly to sleep instead they stay inside until it's time to rest.
It would be nice to see Nitwits with a more exclusive behavior, also for Parity sake.
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Please check if this is still an issue for you in 1.16 Release Candidate 1 or later.