Pigs, sheep, mooshrooms, llamas, horses, mules, donkeys and iron golems keep despawning even if given name tags only chicken, cows, cats and dogs do not despawn. Sometimes when game is loaded passive mobs disappear, even if donkeys, horses, llamas and mules are tamed they still despawn and if given name tags they still despawn.
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migrated
Duplicate of MCPE-21416.