Entities/content

Java Edition only	Giant Illusioner Killer Bunny
Bedrock Edition only	Elder Guardian Ghost
BE & EE only	Agent NPC

Joke features

Bedrock Edition only	Falling Block Top Snow
BE & EE only	Primed Underwater TNT

Java Edition only	Minecart with Furnace with Spawner
Upcoming
Joke features	Obsidian Boat

Stationary objects

Java Edition only	Item Frame Glow Marker
BE & EE only	Camera

Miscellaneous

BE & EE only	Balloon