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  1. Minecraft (Bedrock codebase)
  2. MCPE-156090

Some features/decorators like lava pools, amethyst geodes etc. depend only on the last 32 bits of the 64-bit seed.

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • 1.18.32, 1.19.30, 1.19.41, 1.20.12 Hotfix, 1.20.15 Hotfix
    • Confirmed
    • Multiple

      The locations and shapes of the amethyst geodes, lava pools and possibly even other features only depend on the last 32 bits of the 64-bit seed meaning they are the same for many worlds. Even the budded amethyst block positions in the amethyst geodes are the same. 

       

      Steps to reproduce: 

      1. Create a world with any seed.
      2. Find an amethyst geode or a lava pool and remember its coordinates.
      3. Create a world with the seed of the first world but with any integer multiple of 4294967296 (2^32) added to it.
      4. Go to the feature's coordinates but in the new world.
      5. Compare their locations and their shape.

      Observed results:

      The features have the same shape and location.

      Expected results:

      Every element of a world should depend on all 64 bits of the seed.

      Notes: A similar glitch also effects carver caves (MCPE-154333), structures (MCPE-154939), the end (MCPE-155137) and the nether (MCPE-154947). Only the surface biomes and noise caves of the overworld aren't effected by such a bug.

        1. Amethyst ( seed 10).jpg
          720 kB
          Hotcoco-cat
        2. Amethyst (seed 4294967306 ) .jpg
          715 kB
          Hotcoco-cat
        3. lava ( seed 10).jpg
          766 kB
          Hotcoco-cat
        4. lava (seed4294967306).jpg
          421 kB
          Hotcoco-cat

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              Created:
              Updated:
              Resolved:
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