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  1. Minecraft: Java Edition
  2. MC-270162

The game crashes when attempting to upgrade a world from version 1.12.2 and below

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    • Confirmed
    • Crash
    • Very Important
    • Platform

      The game crashes when trying to upgrade a world from version 1.12.2 and earlier. I won't provide the crash report for privacy reasons, but you can reproduce the issue yourself and obtain the crash report.

      Steps to reproduce

      1. Start version 1.12.2
      2. Generate a new world with the default world type
      3. Launch the latest version of the game
      4. Attempt to upgrade the world by entering it

      Observation: The game crashes.
      Expectation: The game should function without crashing.

      Launcher:

      The game crashed whilst exception loading chunk
Error: java.lang.ClassCastException: class com.mojang.datafixers.util.Either$Right cannot be cast to class com.mojang.datafixers.util.Pair (com.mojang.datafixers.util.Either$Right and com.mojang.datafixers.util.Pair are in unnamed module of loader 'app')

        1. crash-2024-04-02_14.27.51-server.txt
          14 kB
        2. deobf_crash-2024-04-02_14.27.51-server.txt
          17 kB

          [MC-270162] The game crashes when attempting to upgrade a world from version 1.12.2 and below

          [Mod] EVGENSYPERPRO added a comment -

          I can confirm with snapshot 24w13a, version 1.20.4 does not crash. Here is my crash report: crash-2024-04-02_14.27.51-server.txt

          [Mod] EVGENSYPERPRO added a comment - I can confirm with snapshot 24w13a, version 1.20.4 does not crash. Here is my crash report: crash-2024-04-02_14.27.51-server.txt

            boq [Mojang] Bartosz Bok
            NoUser No User
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              Created:
              Updated:
              Resolved:
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