For the nintendo Switch, mobs would despawn all of a sudden. I'm not talking about mobs like random pigs, cows, sheeps, etc. I'm talking about mobs like villagers and horses. My villagers that I have name tags on just despawn and they couldn't have died cause there is no way for them to die to anything. For horses that I tamed, they would just despawn and they couldn't have died cause there is no trace of their loot after they have died.