Minecraft wiki entry for Development_versions, associated text: Adult villagers can now get into beds with low ceilings.
Creepers no longer lose aggro when the line of sight is broken briefly.
Removed the fox “moveToVillage” behavior to match Java Edition.
Mobs can now enter minecarts and boats again. (MCPE-48596)
Dolphins now jump properly again.
Zombies no longer become stuck on doors.
The parrot dancing animation is now at the correct speed. (MCPE-48356)
Parrots can now fly correctly again. (MCPE-47954)
Dolphins now follow players in boats again.