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MC-184268

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-153319MC-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

Related issues

Comments

ampolive

Can confirm in 21w39a.

intsuc

(Unassigned)

Confirmed

Platform

Low

Entities

UUID

1.15.2, 20w20b, 20w21a, 1.16 Pre-release 5, 1.16.1, ..., 23w33a, 1.20.2, 1.21, 1.21.1, 24w33a

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