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Bug
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Resolution: Fixed
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Minecraft 1.13.2, Minecraft 18w43a, Minecraft 18w43b, Minecraft 18w44a, Minecraft 18w45a, Minecraft 18w46a
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None
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Unconfirmed
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(Unassigned)
The bug
When creating a superflat world with the top block level at exactly y=256 the game crashes during generation or almost immediately after entering the world. The preset 255*minecraft:air,minecraft:stone;minecraft:plains;village is one preset that does this.
Disabling surface structures like villages seems to avoid the problem. Enabling normal decoration like trees and grass also works fine.
I haven't yet tested whether or not this also occurs with the newly re-added customized world type.
Note that layers y=255 or below do work fine (MC-136526) while layers y=257 or above crash the editor due to MC-68124.
Crash report
From 1.13.2
Description: Exception generating new chunk java.util.concurrent.CompletionException: java.lang.ClassCastException: bcd cannot be cast to ben at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:604) at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) Caused by: java.lang.ClassCastException: bcd cannot be cast to ben at ti.f(SourceFile:196) at bxb.a(SourceFile:507) at bxb.a(SourceFile:450) at bxh$j.a(SourceFile:1764) at bxc.a(SourceFile:62) at btl.a(SourceFile:78) at bvq.a(SourceFile:16) at bvq.a(SourceFile:13) at bpn.a(SourceFile:27) at ayu.a(SourceFile:504) at bop.a(SourceFile:183) at tr.a(SourceFile:12) at tq.a(SourceFile:35) at bnd.a(SourceFile:95) at tx.a(SourceFile:79) at tx.a(SourceFile:25) at acu$a.a(SourceFile:147) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) ... 6 more