Crash at Mansion(s)

Minecraft crashed sometimes when loading a Mansion(I dont know if that happens everytime, but it did multiple times on my Laptop with the same world(with recreated ones!)

(Seed:-5501412795798286365)

How to reproduce:

1.make the world with the same seed

2. /locate Mansion     (should be at 4704, ?, 4272)

3. fly upwards and destroy blocks in the way, if Minecraft not already crashed

4. Wait a short time on the Mansion if Minecraft didnt crash(up to 7min)

5. CRASH

The game crashed wilst ticking entity

Error:

java.lang.NullPointerException: Cannot invoke "dnm.a()" because "$$1" is null

Exit code: -1