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Villagers Despawn

Tamed wolves and cats despawn

cats vanishing

Nether Fortress - Right Click Modifies Terrain

Tamed dogs vanish when owner is hit by another player

tamed cats despawning randomly

Not Tamed Horses Despawns When Chunks Reload

Despawning of horses.

Animals Spawned With Spawners Will Despawn Eventually if You Try To Make A Good Farm

Ocelots not despawing; accumulate in Jungles over time

Horse Despawned after update

Baby animals despawn/disappear in multiplayer

Baby Zombie despawns taking picked-up items with it.

Untamed wolves and ocelots disappear

Entities are not removed client-side when you are dead

Leads despawn if chunks despawn

Wither Boss disappears

Mob Entities appear to Spawn then Despawn rapidly

Tamed horses despawn

Squids despawn despite being name-tagged

mobs despawning with items on them.

mobs despawn or spawn at sea lanterns (while player is 20-30 blocks away)

Passive mobs (especially named and/or tamed ones) are frequently despawning

bag with teleport to spawn chunk

Persistence loss of mobs changing into other mobs, thus also despawn

Named wandering traders despawn

19w08b ALL entities on the overworld despawn by change to peaseful in the nether

Villagers Disappeared

Horses sometimes disappear when dismounting (Despawns completely)