Minecraft wiki entry for Development_versions, associated text: Increased Iron Golem spawn rate and modified spawn rules. (MCPE-47157)
Fixed the jumping animation of tamed horses.
Fixed Blaze path-finding and navigation. (MCPE-45469)
Fixed a bug that allowed ghasts to exist when the difficulty was set to Peaceful. (MCPE-53383)
Fixed an issue that was preventing pillager captains from being hostile. (MCPE-44987)
Fixed an issue that was allowing fish to spawn in flowing water above ice blocks.
Small mobs will no longer get trapped in gaps created by stair blocks.
Villagers no longer run around inside their houses when being raided.
Mobs no longer start shaking when entering minecarts.
Guardians and elder guardians will no longer float in the air as they try and reach water. (MCPE-33641)
Tweaked squid spawn rate and cap.
Drowned can no longer drop tridents without having them equipped. (MCPE-32731)
Fixed a bug that prevented cats from sleeping on a bed with the player
Snow golems can now try and shoot snowballs at mobs when it is behind a fence block (MCPE-24840)
Fixed a bug that allowed zombie villagers to break iron doors. (MCPE-43725)
Sitting mobs will no longer slide around and breed. (MCPE-62160)