Crash With Ticking Block Entity

I seem to get this issue around 1 or 2 times a day, in this instance it was with black concrete.

1.14.1 Pre-Release 2\: [^crash-2019-05-12_22.59.40-server.txt]

Description: Ticking block entity
 
java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1442)
    at java.util.HashMap$KeyIterator.next(HashMap.java:1466)
    at vg.a(SourceFile:1031)
    at bhi.a(SourceFile:234)
    at bvg.U_(SourceFile:338)
    at bhi.K(SourceFile:625)
    at vg.a(SourceFile:402)
    at net.minecraft.server.MinecraftServer.b(SourceFile:827)
    at ug.b(SourceFile:343)
    at net.minecraft.server.MinecraftServer.a(SourceFile:764)
    at net.minecraft.server.MinecraftServer.run(SourceFile:632)
    at java.lang.Thread.run(Thread.java:748)