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  1. Minecraft: Java Edition
  2. MC-181507

Worlds that have an unknown version now show the latest version


    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • 20w18a
    • None
    • Confirmed
    • Datafixer
    • Important

      The bug

      Worlds that have an unknown version now show the latest version (currently 20w18a).
      Opening such a world causes lots of errors to be logged and corrupts the world:

      Couldn't load chunk [-9, 23]
      	at cgo.a(SourceFile:122)
      	at cgo$$Lambda$3404/1324669015.accept(Unknown Source)
      	at cgu.a(SourceFile:249)
      	at cgu$$Lambda$3406/19164340.accept(Unknown Source)
      	at it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap$MapEntrySet.forEach(Int2IntOpenHashMap.java:927)
      	at cgu.a(SourceFile:249)
      	at cgo.h(SourceFile:121)
      	at cgz.a(SourceFile:101)
      	at yf.l(SourceFile:525)
      	at yf$$Lambda$3328/1853807856.get(Unknown Source)
      	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1582)
      	at alu.c(SourceFile:144)
      	at yr$a.c(SourceFile:540)
      	at alu.w(SourceFile:118)
      	at yr$a.w(SourceFile:549)
      	at yr.d(SourceFile:280)
      	at net.minecraft.server.MinecraftServer.bc(SourceFile:777)
      	at net.minecraft.server.MinecraftServer.w(SourceFile:765)
      	at alu.c(SourceFile:127)
      	at net.minecraft.server.MinecraftServer.v(SourceFile:750)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:532)
      	at net.minecraft.server.MinecraftServer.i_(SourceFile:372)
      	at enx.d(SourceFile:65)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:673)
      	at java.lang.Thread.run(Thread.java:745)

      Note: It appears this does not affect worlds in the "Region file format" (before release 1.2.1).

      Reproduction steps

      1. Start a world in any version before 1.9, or download the attached Test 1_8_9.zip
      2. Copy the world to the saves folder of the current version
      3. Open the world selection in the current version

            boq [Mojang] Bartosz Bok
            ic22487 ic22487
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