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  1. Minecraft: Java Edition
  2. MC-184268

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

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.15.2, 20w20b, 20w21a, 1.16 Pre-release 5, 1.16.1, 20w29a, 1.16.2 Pre-release 1, 1.16.2, 1.16.3, 1.16.4 Pre-release 1, 1.16.4, 20w45a, 20w46a, 20w48a, 20w49a, 20w51a, 21w03a, 1.16.5, 21w15a, 21w16a, 21w19a, 1.17 Pre-release 1, 1.17, 1.17.1, 21w37a, 21w39a, 1.18.1, 1.19.1, 1.19.2, 1.19.3 Release Candidate 1, 1.19.3, 23w03a, 1.19.4 Pre-release 1, 23w18a, 23w33a, 1.20.2
    • Confirmed
    • Entities
    • Low
    • Platform

      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

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            intsuc intsuc
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              Created:
              Updated:
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