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  1. Minecraft: Java Edition
  2. MC-185253

Decorations at chunk borders ignore saved biome information from partially-generated chunks

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: 20w21a
    • Fix Version/s: None
    • Labels:
      None
    • Confirmation Status:
      Confirmed
    • Category:
      World generation
    • Mojang Priority:
      Low

      Description

      The bug

      When a world is loaded in a newer version that has changed the biome generation, and a chunk has the status "biomes" with old biomes saved therein, the chunk with the old saved terrain has the correct decorations for the old biome in the middle of the chunk but not at the chunk borders. The terrain at the edge of the chunk ends up with the correct biome (the saved biome) and mismatching terrain decorations (the biome that would have generated had the chunk been empty instead of partially generated).

      Seed1.zip is a 1.15.2 world save where this issue can be reproduced. Using an NBT editor, four chunks in a 2×2 square have been reset to the "biomes" status. These chunks are located in region 0,0 and chunk coordinates 22,24; 22,25; 23,24 and 23,25. The biomes in these chunks is minecraft:nether_wastes (biome id: 8) because this is a 1.15.2 world save. When the world loads in 20w21a, the player will be in the Nether in the vicinity of a nether portal. To reproduce the issue, go into spectator mode and fly towards 368,400 where the chunks are. The borders of these chunks will have crimson nylium and crimson fungus blocks. This should not occur because the world save has no crimson forest biome here. 2020-05-23_14.05.55.png is a screenshot of this location after loading it in 20w21a.

        Attachments

        1. 2020-05-23_11.52.02.png
          2020-05-23_11.52.02.png
          1.97 MB
        2. 2020-05-23_11.58.41.png
          2020-05-23_11.58.41.png
          1.95 MB
        3. 2020-05-23_14.05.55.png
          2020-05-23_14.05.55.png
          3.96 MB
        4. Seed1.zip
          8.23 MB

          Activity

            People

            Assignee:
            Unassigned Unassigned
            Reporter:
            bdm68 bdm68
            Votes:
            2 Vote for this issue
            Watchers:
            0 Start watching this issue

              Dates

              Created:
              Updated:
              CHK: