[MC-190166] Game crashes when burning a tree in a custom dimension: java.lang.NullPointerException: Exception while ticking

I was trying to burn down a tree in a custom dimension. Few seconds later my game crashed.
After I tried to enter the same world game also crashed, and it continues to do.

Stack trace

1.16-pre7: crash-2020-06-17_10.51.58-server.txt

Description: Exception while ticking

java.lang.NullPointerException: Exception while ticking
	at bvr.a(SourceFile:136)
	at cfj$a.a(SourceFile:938)
	at bxv.a(SourceFile:137)
	at cfj$a.a(SourceFile:873)
	at zd.b(SourceFile:596)
	at zd$$Lambda$3971/1070533445.accept(Unknown Source)
	at bqo.b(SourceFile:84)
	at zd.a(SourceFile:351)
	at net.minecraft.server.MinecraftServer.b(SourceFile:873)
	at net.minecraft.server.MinecraftServer.a(SourceFile:813)
	at epa.a(SourceFile:93)
	at net.minecraft.server.MinecraftServer.v(SourceFile:672)
	at net.minecraft.server.MinecraftServer.a(SourceFile:256)
	at net.minecraft.server.MinecraftServer$$Lambda$3959/1820516307.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:745)