I the recent days my wheat farmer completely disappeared. I had gotten my first farmer from the farmer challenges and had it for a few days then it completely disappeared and I asked around what to do and people said be sad, so maybe get it back from admins or something
Sometimes Villagers can vanish and never reappearance is also a possibility. All caves have been shut, and the village has been walled. They simply vanish, sometimes reappearing a few game days later, and other times being lost permanently.