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Potion of invisibility doesn't prevent mobs from attacking a player

Mobs repetitively despawn and respawn rapidly at high Y coordinates (causing lag)

Hostile mobs can spawn on magma block

Hostile mobs forget you exist the second you exit their line of sight

All mobs and items disappearing after every death

Phantoms swoop down and go back up without charging towards or attacking the player.

Drowned do not attack nor burn outside water. They become neutral.

Hostile mobs that are spawned with a named spawner egg like: "rat" despawn

Some mobs such as Zombies look away after each time they hit you