I own a 2 player realm world and occasionally my friend and I will log onto the realm to find our animals and villagers have disappeared. The world is on peaceful mode so no hostile creatures could kill them. Our horses thst were tamed and had a lead on them disappeared and on top of that half of our farm animals that were in pens have disappeared as well, and our villagers that live in a village with a wall surrounding it are still disappearing, even when they have name tags on them.