Game sometimes freezes during the loading world, when upgrading from 1.12.2

Game freezes during the loading world, when upgrading from 1.12.2.

Occurred in:
When you have a shulker, shulker box, rabbit and llama in the old world.

Game output:

Encountered an unexpected exception
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 974
	at net.minecraft.server.MinecraftServer.i_(SourceFile:394)
	at dal.a(SourceFile:115)
	at dal.d(SourceFile:131)
	at net.minecraft.server.MinecraftServer.run(SourceFile:502)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 974
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2272)
	at net.minecraft.server.MinecraftServer.i_(SourceFile:392)
	... 4 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 974
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$MapIterator.nextEntry(Long2LongLinkedOpenHashMap.java:1207)
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$EntryIterator.next(Long2LongLinkedOpenHashMap.java:1299)
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$EntryIterator.next(Long2LongLinkedOpenHashMap.java:1288)
	at aum.a(SourceFile:25)
	at aum.get(SourceFile:49)
	at it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction.get(AbstractLong2ObjectFunction.java:148)
	at java.util.Map.computeIfAbsent(Map.java:955)
	at sz.a(SourceFile:42)
	at sz.a(SourceFile:23)
	at zx.c(SourceFile:102)
	at sg.d(SourceFile:153)
	at bor.a(SourceFile:231)
	at bor.a(SourceFile:80)
	at bqv.a(SourceFile:16)
	at bqv.a(SourceFile:13)
	at bkw.a(SourceFile:27)
	at avl.a(SourceFile:479)
	at bjy.a(SourceFile:143)
	at su.a(SourceFile:12)
	at st.a(SourceFile:33)
	at biq.a(SourceFile:85)
	at sz.a(SourceFile:54)
	at sz.a(SourceFile:23)
	at zx$a.a(SourceFile:143)
	at zx$a$$Lambda$899/1679059495.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Couldn't stop taskManager
java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: 974
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2237)
	at zx.b(SourceFile:92)
	at zz.a(SourceFile:23)
	at sg.close(SourceFile:265)
	at aut.close(SourceFile:1701)
	at sh.close(SourceFile:1038)
	at net.minecraft.server.MinecraftServer.j_(SourceFile:474)
	at dal.j_(SourceFile:311)
	at net.minecraft.server.MinecraftServer.run(SourceFile:565)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 974
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$MapIterator.nextEntry(Long2LongLinkedOpenHashMap.java:1207)
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$EntryIterator.next(Long2LongLinkedOpenHashMap.java:1299)
	at it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap$EntryIterator.next(Long2LongLinkedOpenHashMap.java:1288)
	at aum.a(SourceFile:25)
	at aum.get(SourceFile:49)
	at it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction.get(AbstractLong2ObjectFunction.java:148)
	at java.util.Map.computeIfAbsent(Map.java:955)
	at sz.a(SourceFile:42)
	at sz.a(SourceFile:23)
	at zx.c(SourceFile:102)
	at sg.d(SourceFile:153)
	at bor.a(SourceFile:231)
	at bor.a(SourceFile:80)
	at bqv.a(SourceFile:16)
	at bqv.a(SourceFile:13)
	at bkw.a(SourceFile:27)
	at avl.a(SourceFile:479)
	at bjy.a(SourceFile:143)
	at su.a(SourceFile:12)
	at st.a(SourceFile:33)
	at biq.a(SourceFile:85)
	at sz.a(SourceFile:54)
	at sz.a(SourceFile:23)
	at zx$a.a(SourceFile:143)
	at zx$a$$Lambda$899/1679059495.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)