As far as I can tell, the breeder block only will produce base plains biome villagers. I've tried using them in other biomes, like desert, but I always get plains, so my best educated guess is that breeder mechanics don't take into account biomes for generating the different villager looks. I've also bred over a hundred villagers so far, and none have matured into nitwits. Does the breeder prevent this?

At any rate, two feature requests:

1. Allow the breeders to create villager babies based on the biomes the breeder blocks are located in.
2. Allow the breeder to produce nitwits.
3. Optionally, maybe both of these could be configuration toggles on/off?

Thank you so much for this mod. It made the game far more enjoyable.

Thank you for reporting this issue! It should be fixed in the latest version.