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Bug
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Resolution: Fixed
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Minecraft 1.14, Minecraft 1.14.1 Pre-Release 1, 1.15.2, 20w13b, 20w15a, 20w21a, 1.16 Pre-release 8, 1.16.1, 20w28a, 20w29a, 1.16.4 Pre-release 2, 20w46a
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None
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Java 11 or newer
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Confirmed
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Crash
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Very Important
When attempting to play attached world in Minecraft client, game may crash, then freeze. Doesn't always happen. Crash report is only printed in launcher, not saved.
1.14: crashreport.txt
java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at cje.b(SourceFile:67) at cje.a(SourceFile:57) at cff.a(SourceFile:98) at cfi.a(SourceFile:86) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) 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.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at cfi.a(SourceFile:86) at cfd$c.a(SourceFile:175) at java.base/java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:212) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654) 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.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) at java.base/java.util.stream.IntPipeline.reduce(IntPipeline.java:496) at java.base/java.util.stream.IntPipeline.max(IntPipeline.java:459) at cfd$c.a(SourceFile:176) at cfd$c.<init>(SourceFile:98) at cfd.a(SourceFile:280) at cet.a(SourceFile:25) at ces$a.a(SourceFile:89) at bwy.a(SourceFile:187) at bxc.d(SourceFile:44) at bxc.a(SourceFile:199) at us.a(SourceFile:461) at com.mojang.datafixers.util.Either$Left.map(Either.java:38) at us.a(SourceFile:455) at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1072) at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) at uu.b(SourceFile:57) at agk.e(SourceFile:83) at agk.a(SourceFile:123) at agk.run(SourceFile:91) at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)