(18w30a) [^crash-2018-07-25_11.47.19-server.txt]
Description: Exception ticking world entities
java.lang.ArrayIndexOutOfBoundsException: -1
at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet.fixPointers(ObjectLinkedOpenHashSet.java:851)
at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet$SetIterator.remove(ObjectLinkedOpenHashSet.java:1057)
at axu.l(SourceFile:1118)
at tc.l(SourceFile:493)
at net.minecraft.server.MinecraftServer.b(SourceFile:736)
at net.minecraft.server.MinecraftServer.a(SourceFile:661)
at dfz.a(SourceFile:158)
at net.minecraft.server.MinecraftServer.run(SourceFile:564)
at java.lang.Thread.run(Thread.java:745)
Related issues
discovered while testing
is duplicated by
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This causes crashes!

This issue is causing crashes for me, report attached.
[media]
Uploaded another crash report. Also the level.dat file gets deleted when it crashes and level.dat_old is corrupted.

Can confirm, happened to me as well.

Is there a CI build that we can run/test prior to the next snapshot coming out?
Cheers and Thanks,
Bryan

Not fixed in 18w30b, as chickens spawned from eggs still float.
Does your game still crash? If not, your issue might be MC-134974.

Nope. Still experiencing the issue before this ticket got hijacked by the crash bug.

Fully fixed in 18w31a, it seems.