[MC-86138] Pick block on Mob (Dragon) Head / Structure block crashes the game

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Affected blocks:

Heads
Flower pots
Structure blocks

I just middleclicked the dragon head and it crashed, and I have tested this with multiple settings.

Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at acj.a(SourceFile:401)
	at yp.k(SourceFile:282)
	at yq.m(SourceFile:404)
	at biz.m(SourceFile:708)
	at rd.r_(SourceFile:1436)
	at yq.r_(SourceFile:229)
	at biz.r_(SourceFile:114)
	at agh.a(SourceFile:1414)
	at agh.g(SourceFile:1392)
	at agh.j(SourceFile:1285)
	at ayy.s(SourceFile:1845)
	at ayy.au(SourceFile:879)
	at ayy.a(SourceFile:328)
	at net.minecraft.client.main.Main.main(SourceFile:125)