On the first of April (April Fools) this year, Mojang released a special update for Java Edition: AT
22w13-one-block-at-a-time!
In the update, the inventory was removed so you could only carry ONE BLOCK AT A TIME.
Right clicking on a mob would pick it up. The Wither could not be picked up or ridden. Horses you could ride like normal -almost. Right clicking an Ender Dragon would make you ride it. I think right clicking with a mob or block in your hands would THROW it down.
There was no warden or allay.
Glass was made 50% more realistic.
You could not use tools (e.g. pickaxe / flint and steel). They could only be thrown.
Picking up an Enderman would mean you could not go in water without being teleported. The Enderman would teleport you randomly.
Thanks for reading! This is all I could remember.