The bug

Villages only seem to spawn on the edge of a biome it is allowed to spawn in. This results in unusual village generation. A desert village will only seem to generate when right next to another biome like a savanna for example, not only causing it to look weird, but leaving the rest of the desert empty of any villages.
This also applies to biomes like tundra villages spawning right next to tundra mountains biomes, still making for unusual generation.