Due to changes in the spawn rules around Nitwits they became uncommon/rare in general, this must've happened during the 1.14 update, that changed the whole trading, look and interaction of our big nosed friends. So not being able to get these 2 types of nitwits has been an issue since april 2019.
Generated villages will spawn Nitwits but since Jungle and Swamp villages don't exist by default both type of Nitwits are simply said extinct in Minecraft!
I guess every new mob costs us an old one?
How to generate this bug or lack of nitwits; Open a survival world and try to find a jungle or swamp village, spoiler, they don't exist.
Breeding doesn't spawn nitwits anymore, so building a breeder in a Swamp or Jungle biome won't give you said nitwits nor any other.
This lack of nitwits has been the case since 1.14, eventhough Nitwits may be useless to some, especially for players who don't know the game from earlier days, that doesn't mean an existing mob should just be deleted or suddenly become rare.
Suggested solution: Simply add nitwits back to the breeding system.
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duplicates 1
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Duplicate of MC-156556.
Ok, well percentages are pretty insanely low, and don't ask me why these previously prominent additions had to become so rare while other features turned so easy its almost childish. Even nitwits in breeding made it a bit tougher, but not much. Been playing this game since 2012 and still don't understand the reasoning behind the developers and sometimes odd out of nothing decesions, from frogs that can't eat fireflies "because they can't/won't irl" yet campfires are now harmless (so in irl fire is safe to play with?)
I'll leave it with that. Seeing that other bug report has been there since 2019 not even assigned... Is this website going to same path as the feedback site? I just care about the game and keeping it's quality, not for it's PR and hyped empty promises.
This could be working as intended. Swamp and jungle zombie nitwit villagers can spawn, so these nitwits can exist in survival mode gameplay by curing a zombie nitwit villager of the appropriate type. For similar reasons, baby nitwits of all kinds can only be obtained by curing a baby zombie nitwit villager.