Mobs and items placed on the End Island portal do not appear in the overworld

Mobs when crossing the end portal to the Oveword appear in a z-coordinate above the world boundary

Game with friends always crashes when opening shulker box.

The sand breaks when the block it is on is retracted by a sticky piston

The water that was on a soul sand forming a bubble column keeps the bubbles when the water is removed by an dispenser

My villagers are disappearing with time.