ConcurrentModificationException caused by minecraft:piston

Game randomly crashed with a "Ticking block entity" error when I returned to the Overworld from The End.

Crash log contains full information about the situation.

1.14.4.\: [^crash-2019-09-11_13.43.59-server.txt]

Description: Ticking block entity

java.util.ConcurrentModificationException
	at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1490)
	at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1513)
	at vk.a(SourceFile:1037)
	at bhr.a(SourceFile:233)
	at bvp.T_(SourceFile:338)
	at bhr.K(SourceFile:624)
	at vk.a(SourceFile:405)
	at net.minecraft.server.MinecraftServer.b(SourceFile:835)
	at net.minecraft.server.MinecraftServer.a(SourceFile:774)
	at eac.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:642)
	at java.base/java.lang.Thread.run(Thread.java:835)