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  1. Minecraft: Java Edition
  2. MC-201704

Leveling up a Cartographer to Journeyman or searching for a Woodland Mansion, Nether Fossil, or End City with /locate causes a tick freeze in custom worlds with no terrain


    • Icon: Bug Bug
    • Resolution: Unresolved
    • None
    • 1.16.3, 1.16.4, 20w46a, 1.19.3, 23w03a, 24w12a
    • Confirmed
    • Crash
    • Important
    • Platform

      The bug

      If a world using custom generation has Mansion generation enabled but has noise settings such that no terrain generates anywhere, then leveling up a cartographer to Journeyman or typing the command /locate mansion causes a tick freeze that prevents debug crashes from working. The same applies with /locate nether_fossil in the Nether, and /locate endcity in the End.

      How to reproduce

      1. Open the attached world, or generate a world using the Import Settings button and the attached generation preset. (The attached world has a normal Nether and End.) The game mode must be Creative or Spectator to prevent an infinite death loop.
      2. Execute the command /locate mansion, or level up a cartographer villager to Journeyman
        Entities and some other processes stop working, and trying to force a debug crash never finishes, similarly to the effects of MC-175269.

      Note 1: In the attached world, teleporting to the coordinates where the same seed produces a known Woodland Mansion reveals there is no mansion in sight.

      Note 2: I have tested all other structures to see which ones cause the issue.

      • Nether Fossils and End Cities do not generate and cause the same issue as Mansions when using /locate.
      • Buried Treasure does not generate a chest. Depending on the exact world generator settings used, /locate buried_treasure will either output "Could not find the structure nearby", or will point to where a buried treasure chest would be generated normally. In the former case, any treasure maps generated from Shipwreck or Ocean Ruin loot will be replaced by empty maps.
      • Mineshafts and Strongholds do not generate, and /locate mineshaft outputs "Could not find the structure nearby". Eyes of Ender do nothing.
      • Ocean monuments still generate, surrounded by a cuboid of water. Ocean explorer maps are not broken.
      • Ruined Portals generate in the Nether but not in the Overworld; /locate ruined_portal finds a location in both dimensions, but nothing is generated at said location in the Overworld.
      • Bastion Remnants float, with the bottom near y:31.
      • All other structures generate on top of the void and are findable via /locate as normal. Underground parts of certain structures, such as igloo basements, do not generate. In 20w46a, the bottom two blocks of buildings are missing; the lowest generated block is at y:1.

            Unassigned Unassigned
            JuniorJedi256 Math Nerd
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