[MC-105695] Crash: Tesselating block model 'java.lang.ArrayIndexOutOfBoundsException: 16384'

Whilst moving around a custom map (which I've generated programatically), Minecraft crashes. Sample crash reports are attached. The crash seems to happen randomly rather than that any particular location so I don't believe its due to anything with particular blocks.

I've upgraded video drivers to the latest version but crash still happens.

Description: Tesselating block model

java.lang.ArrayIndexOutOfBoundsException: 16384
	at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.rehash(Long2ObjectOpenHashMap.java:811)
	at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.insert(Long2ObjectOpenHashMap.java:261)
	at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.put(Long2ObjectOpenHashMap.java:266)
	at air.a(SourceFile:49)
	at air.a(SourceFile:57)
	at aiu.a(SourceFile:51)
	at asv.a(SourceFile:942)
	at aim.b(SourceFile:166)
	at ais.a(SourceFile:36)
	at ais.a(SourceFile:47)
	at bdg$6.a(SourceFile:73)
	at bdg.a(SourceFile:193)
	at box.a(SourceFile:144)
	at box.b(SourceFile:76)
	at box.a(SourceFile:48)
	at box.a(SourceFile:41)
	at bov.a(SourceFile:66)
	at bqy.b(SourceFile:182)
	at bqu.a(SourceFile:100)
	at bqu.run(SourceFile:43)
	at java.lang.Thread.run(Thread.java:745)