Nametags Don't Persist on Named Mobs

Paintings Despawning When Leaving The Game or The Overworld

Mobs including Tamed and Hostile Mobs automatically despawn

Mobs will sometimes disappear from the game, including tamed mobs

Surrounding a Mob Spawner with torches will not stop it from spawning hostile mobs

Diamond tools break faster than they should

Renaming a map in realms will clear the map and deemed it unusable

Hitting a mob while switching a weapon with a clear slot from your inventory will clone the weapon

Placing an item on an item frame causes the whole Realms server to crash for a few minutes