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Witches despawning in swamp huts

Zombie villagers are able to despawn during curing process

"Persistent" Mobs Still Despawn on Peaceful Switch, Take Loot With Them

Tamed dogs vanish when owner is hit by another player

Boats despawn when you get out

Farm animals and some other passive mobs except tamed horses with items in their inventory despawn on "Flat" type multiplayer server. It also seems that zombies with armor on also do not despawn.

When a chunk containing a lead is unloaded, the lead breaks.

Creepers explode but do not despawn afterward.

Iron golem disappeared

Arrows fired from dispenser into block don't despawn

Chicken Jockeys

Villager on minecart despawns

Wither Boss disappears

LAN Multiplayer doesn't save guest-player horse (is gone upon reload)

Items despawn after one minute instead of five when dropped from the Creative inventory

Despawning animals, even when tied to a post and enclosed in a pen

Endermen holding a block can despawn

Mobs equipping items from dispensers can despawn

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

When opening, or playing game crashes and required to reopen

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

Villagers missing, villagers despawning, villagers vanishing

Trader llamas disappear

I imprtet a old map ( start May 2014 ) and now no plants are growing.

Horse despawning

Villagers with name tag and job, disappearing in hardcore world

Mobs despawn in mid-air

Ghast fireballs do not despawn when ghast is killed