Minecraft wiki entry for Development_versions, associated text: Fixed a bug where parrots could fly upwards indefinitely.
Zombie villagers spawned from zombie spawners on Marketplace worlds that were created after version 1.11 now correctly spawn as V2 zombie villagers. When cured, they will now correctly turn into V2 villagers.
Horses, Donkeys, Mules, Skeleton Horses, and Zombie Horses can now properly be given custom names, and identified using their respective "runtime_identifier".