I'm in a survival mode realm with my friends and we found this village, it's a naturally spawned village, but all of the villagers ended up dying. So, we caught some zombie villagers and cured them. We now have three villagers in the village, but they won't breed. The village has plenty of beds and doors, and I've given them loads of bread and carrots, and traded with them, but nothing happens. They just pick it up and nothing occurs. They don't acknowledge the food, and no hearts or anything appears above them.