Villager AI is broken. They leave the village, wander around at night.

I made a world with 1.12 then updated to snapshot. I thought that's why villagers were leaving the village. So I made a new world with the latest snapshot and they are still wandering around and leaving the village. They stay outside at night too. Some farmers will harvest the crops even at night. But they eventually all just wander away from the village. I have screenshots on my pc if you need them I can add them later? Thanks