The bug

Blacksmith houses in desert villages are partially made out of cobblestone and partially made out of sandstone. Them being made out of cobblestone is intentional (see MC-102606), but the sandstone mixed in with the cobblestone looks very weird and out of place.

How to reproduce

1. Create a new Buffet world and select Desert in the Biome selection menu
2. Search for a village that has a blacksmith house
   → The house is made out of both cobblestone and sandstone