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  1. Minecraft: Java Edition
  2. MC-239900

Upgrading custom world to 21w43a ignores min_y and height


    • Icon: Bug Bug
    • Resolution: Fixed
    • 1.18 Pre-release 6
    • 21w43a
    • None
    • Confirmed
    • Custom Worlds
    • Important

      The bug

      If you open this custom world 21w42a-height4064.json in 21w43a after you generated it in 21w42a results in all terrain below -64 disappearing and any blocks being placed above 320 / max_y.

      How to reproduce

      1. Open Minecraft in 21w42a
      2. Create a world using the custom world settings in 21w42a-height4064.json
        Enter spectator mode, and observe that the world bottom is lower than Y=-64 and world top is higher than Y=320 (e.g. by placing a block above it)
      1. Open Minecraft in 21w43a
      2. Play the world you created previously to upgrade it
        The terrain previously generated below Y=-64 has been removed, and the bottom of the world is now found at Y=-64.
        Blocks above Y=320 are removed, and the top of the world is now found at Y=320

      Expected behaviour

      1. The upgraded world would not have all terrain below Y=-64 and above Y=320 removed, the dimension's bounding boxes / min_y and height should stay unchanged.


      Couldn't load chunk [11, -4]
      java.lang.ArrayIndexOutOfBoundsException: Index 58 out of bounds for length 24
      	at cow.a(SourceFile:350)
      	at cow.a(SourceFile:290)
      	at cps.a(SourceFile:202)
      	at abu.m(SourceFile:579)
      	at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1764)
      	at atg.c(SourceFile:151)
      	at acf$b.c(SourceFile:534)
      	at atg.y(SourceFile:125)
      	at acf$b.y(SourceFile:543)
      	at acf.d(SourceFile:278)
      	at net.minecraft.server.MinecraftServer.be(SourceFile:763)
      	at net.minecraft.server.MinecraftServer.y(SourceFile:751)
      	at atg.c(SourceFile:134)
      	at net.minecraft.server.MinecraftServer.x(SourceFile:736)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:497)
      	at net.minecraft.server.MinecraftServer.f_(SourceFile:329)
      	at fcg.e(SourceFile:72)
      	at net.minecraft.server.MinecraftServer.w(SourceFile:655)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:269)
      	at java.base/java.lang.Thread.run(Thread.java:831)

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            Tycho Los BBLZ
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