Minecraft wiki entry for Development_versions, associated text: Shulker Boxes no longer lose their inventory when undyed in cauldrons (MCPE-108196).
Added new logic for mobs dismounting rideables.
This also introduces a more fine grained entity height check allowing different dismount places for entities of different heights.
The player will no longer dismount into liquids (lava or water) from rideables such as boats.
Sign in failures now have a more helpful error message and provide error codes.