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  1. Minecraft (Bedrock codebase)
  2. MCPE-186928

Chunks in all dimensions have their biome replaced with an Ocean biome upon reloading in updated older worlds created prior to <1.17.40

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    • Icon: Bug Bug
    • Resolution: Fixed
    • 1.21.50.25 Preview, 1.21.41 Hotfix
    • 1.21.50.24 Preview, 1.21.50.20 Preview, 1.21.40.25 Preview, 1.21.40.21 Preview, 1.21.40.23 Preview
    • None
    • Confirmed
    • Multiple
    • 1314618

      In worlds created prior to 1.17.40 (as of my testing) and or updated to the Non-Preview (1.21.30 currently) changes parts of the Nether Biomes to an Overworld Biome (most likely Ocean) upon reloading for a second time wiping out the Nether Biome data in some chunks.

      Steps to reproduce:

      1. Import the provided test world into 1.21.40.23 Preview and load
      2. Observe the Nether Biomes are expected
      3. Enter the portal and come back or Exit the world and rejoin it
      4. The Nether Biomes switched to an Overworld Biome and the fog is gone

      The Overworld and End dimensions are also affected by this issue.

        1. world_resource_packs.json
          1 kB
        2. world_resource_pack_history.json
          4 kB
        3. world_icon.jpeg
          world_icon.jpeg
          64 kB
        4. world_behavior_packs.json
          1 kB
        5. world_behavior_pack_history.json
          2 kB
        6. Started in 1.17.40 Test World.mcworld
          783 kB
        7. Screenshot 2024-10-16 185134.png
          Screenshot 2024-10-16 185134.png
          2.73 MB
        8. Screenshot 2024-10-16 170742.png
          Screenshot 2024-10-16 170742.png
          1.97 MB
        9. Screenshot 2024-10-16 170102.png
          Screenshot 2024-10-16 170102.png
          1.85 MB
        10. MANIFEST-054221
          9 kB
        11. levelname.txt
          0.0 kB
        12. level.dat_old
          3 kB
        13. level.dat
          3 kB
        14. image-2024-10-18-17-50-32-151.png
          image-2024-10-18-17-50-32-151.png
          66 kB
        15. d11b5bc6-3077-41bf-b6f3-308349e67f8d.png
          d11b5bc6-3077-41bf-b6f3-308349e67f8d.png
          2.94 MB
        16. CURRENT
          0.0 kB
        17. Before.png
          Before.png
          1.16 MB
        18. After.png
          After.png
          2.83 MB
        19. 8bd58002-d02a-454d-b3c6-955aa83fda31.png
          8bd58002-d02a-454d-b3c6-955aa83fda31.png
          2.89 MB
        20. 053551.ldb
          898 kB
        21. 052904.ldb
          23 kB
        22. 051949.ldb
          90 kB
        23. 051942.ldb
          2.03 MB
        24. 051941.ldb
          2.01 MB
        25. 051939.ldb
          2.02 MB
        26. 051571.ldb
          2.04 MB
        27. 051570.ldb
          4 kB
        28. 051569.ldb
          2.02 MB
        29. 051568.ldb
          2.02 MB
        30. 051567.ldb
          2.02 MB

            TMC tmc249
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              Created:
              Updated:
              Resolved:
              CHK: