Check the crashlog
Description: Exception ticking world entities
java.lang.NullPointerException: Exception ticking world entities
at axu.l(SourceFile:1087)
at tc.l(SourceFile:493)
at net.minecraft.server.MinecraftServer.b(SourceFile:736)
at net.minecraft.server.MinecraftServer.a(SourceFile:661)
at dfz.a(SourceFile:158)
at net.minecraft.server.MinecraftServer.run(SourceFile:564)
at java.lang.Thread.run(Thread.java:745)
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Can confirm with a newly created world in 18w30a. The crash does not happen until the player returns to the Overworld. Attached affected world.

For me the crash happened in the Nether

Interesting... my game did not crash in the Nether, but after the TNT explosion, the dropped item entities appeared to "glitch out" and teleport upwards sometimes. I went through the portal afterward and the game crashed.
I was in creative mode.

Confirmed for 18w30a.
@unknown , yes, it does.
Does this still occur in 18w30b?

No, seems to be fixed.

Yeah, it's fixed in 18w30b
Can you attach your world? Does it happens in new worlds too?