The blacksmith and the church structures in the desert villages are generating with cobblestone instead of sandstone.
The well isn't generating with cobblestone but is generating with gravel on the path, instead of sandstone.
The first two screenshots have been taked in 16w21b and the other two in 1.9.4 (when wasn't any bug).
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Probably it was introduced in 16w21a to prevent Savanna Villages from burning out but I have just test in 16w21b.