The bug
Blacksmith in plains village have a strange room. I don't kown what is it but monsters spawn inside it. I don't know if it WAI bug normally no.
This happens since 18w48a.
How to reproduce
Create a new superflat world with this seed:
-2608543111006229119
And teleport to
/tp @s 125.05 9.00 776.37 -1893.74 13.05
Thank you for your report!
However, this issue is a Duplicate of MC-140448.
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