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  1. Minecraft: Java Edition
  2. MC-227268

Maps don't work properly in old terrain when caves and cliffs data pack is enabled

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    • Icon: Bug Bug
    • Resolution: Invalid
    • None
    • 1.17 Pre-release 4
    • None
    • Confirmed
    • Custom Worlds, Maps

      Maps don't work correctly anymore after enabling the Caves & Cliffs preview data pack, in chunks that were generated without the data pack.

      To reproduce

      1. Create a singleplayer world in latest release 1.16.5 in creative mode.
      2. Give yourself two empty maps and use them.
      3. Lock one of the maps using a cartography table and a glass pane
      4. Save the world
      5. Add the Caves and Cliffs preview data pack to the world
      6. Open the world in the latest 1.17 snapshot
        The unlocked map will look stone-like
      7. Create a new map in newly generated chunks
        The map looks correct

      Screenshots


      Notes

      • The altered map seems to fill data from lower chunks of the overworld.
      • It is possible to see lava flowing at such lower levels.
      • Reason of this bug could be how map drawing code handles fields logical_height, height, min_y, has_ceiling inside dimension_type/overworld.

        1. locked-map-1.png
          243 kB
          alef
        2. map-1.png
          241 kB
          alef

            Unassigned Unassigned
            alef alef
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              Created:
              Updated:
              Resolved:
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