---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 01/11/2021 14:14
Description: Exception in server tick loop

java.util.concurrent.CompletionException: z: Accessing PalettedContainer from multiple threads
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
	at abw.b(SourceFile:58)
	at atj.g(SourceFile:91)
	at atj.a(SourceFile:146)
	at atj.run(SourceFile:102)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: z: Accessing PalettedContainer from multiple threads
	at abu.a(SourceFile:635)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at abu.a(SourceFile:617)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146)
	... 11 more
Caused by: java.lang.IllegalStateException
	at aii.a(SourceFile:27)
	at aii.a(SourceFile:19)
	at cpn.a(SourceFile:52)
	at cph.a(SourceFile:58)
	at cou.a(SourceFile:35)
	at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.computeIfAbsent(Long2ObjectOpenHashMap.java:499)
	at cou.a(SourceFile:32)
	at cwk.a(SourceFile:150)
	at cwk.a(SourceFile:52)
	at cur.a(SourceFile:63)
	at cux.a(SourceFile:38)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at cux.a(SourceFile:29)
	at cur.a(SourceFile:63)
	at cux.a(SourceFile:38)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at cux.a(SourceFile:29)
	at cur.a(SourceFile:63)
	at cux.a(SourceFile:38)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.IntPipeline$1$1.accept(IntPipeline.java:180)
	at java.base/java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:104)
	at java.base/java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:699)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
	at cux.a(SourceFile:29)
	at cur.a(SourceFile:63)
	at cox.a(SourceFile:288)
	at coz.c(SourceFile:157)
	at coz.a(SourceFile:292)
	at abu.a(SourceFile:623)
	... 14 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 21w43a
	Minecraft Version ID: 21w43a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 16.0.1, Microsoft
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
	Memory: 2002648400 bytes (1909 MiB) / 3221225472 bytes (3072 MiB) up to 3221225472 bytes (3072 MiB)
	CPUs: 4
	Processor Vendor: GenuineIntel
	Processor Name: Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz
	Identifier: Intel64 Family 6 Model 60 Stepping 3
	Microarchitecture: Haswell (Client)
	Frequency (GHz): 3,19
	Number of physical packages: 1
	Number of physical CPUs: 4
	Number of logical CPUs: 4
	Graphics card #0 name: NVIDIA GeForce GTX 1660
	Graphics card #0 vendor: NVIDIA (0x10de)
	Graphics card #0 VRAM (MB): 4095,00
	Graphics card #0 deviceId: 0x2184
	Graphics card #0 versionInfo: DriverVersion=30.0.14.7196
	Memory slot #0 capacity (MB): 4096,00
	Memory slot #0 clockSpeed (GHz): 1,60
	Memory slot #0 type: DDR3
	Memory slot #1 capacity (MB): 4096,00
	Memory slot #1 clockSpeed (GHz): 1,60
	Memory slot #1 type: DDR3
	Virtual memory max (MB): 15811,52
	Virtual memory used (MB): 11424,27
	Swap memory total (MB): 7680,00
	Swap memory used (MB): 151,03
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx3G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [aci['LITELOT'/85, l='ServerLevel[New World]', x=2735.99, y=8.02, z=1181.20]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Client jar signature and brand is untouched; Server jar signature and brand is untouched