A world can have an entity with the same UUID in each dimension

The bug

A world can have an entity with the same UUID in each dimension. This causes various issues like MC-151270, MC-153319, MC-184266, or MC-195337.

How to reproduce

1. Add an entity with UUID 0-0-0-0-2cfcc in the overworld.

   /execute in minecraft:overworld run forceload add 0 0
   /execute in minecraft:overworld run summon minecraft:item_frame 0 0 0 {UUID: [I; 0, 0, 0, 184268], Fixed: true}

2. Add an entity with UUID 0-0-0-0-2cfcc in the nether.

   /execute in minecraft:the_nether run forceload add 0 0
   /execute in minecraft:the_nether run summon minecraft:item_frame 0 0 0 {UUID: [I; 0, 0, 0, 184268], Fixed: true}

   → ❌ Summoned new Item Frame