Minecraft wiki entry for Development_versions, associated text: Fixed an issue where custom items were not added to the Creative item inventory and therefore could not be used with commands
Fixed a bug where a request queued with /schedule would not clear out when executed and would execute when re-entering a level
Fixed issues with the /schedule command that would consider an area loaded before it was actually loaded, and the command now respects which dimension it is queued in
Fixed issue with Blocks sync
Fixed animations not running on mobs spawned with custom events
Fixed issue where on_interact would duplicate the item used if an event response killed the player
Fixed custom items functioning or rendering correctly on the client in a client/server scenario