Deasert Villages Chruch and Blakcsmith Cobblestone not Sandstone

Churches and Blacksmiths in desert villages spawn with cobblestone.

What I expected to happen was a village would spawn normally.

What actually happened was that churches and blacksmith shops spawned MOSTLY (see attached pictures) made of cobblestone, however, steps and a few other blocks (like the wood from a plains blacksmith shop) were spawned in normal sandstone.

Steps to Reproduce:
1. Generate a new world,
2. Find a desert village
3. The church and blacksmith will be mostly made of cobblestone