Island.
Outback.

It's not a really big deal, but i don't feel like sand buildings of desert villages are really appropriate for this biome, nor the desert villagers themselves. I also use Repurposed Structures, so if the biome was somehow classified as "jungle", it could also spawn jungle villages, but for the ones who don't use that mod, a savanna village would be fine as well. Palmtrees are also made of jungle logs.
Also the Outback biomes shoul have the savanna type villager, as it's a biome more similar to a savanna than to a desert, and has acacia trees as well. Anything really gamebreaking but a bit jarring imo. Jungle (or vanilla savanna) villages on the Volcanic Island biomes and the savanna villages on the outback also look good, while the desert ones are... a bit of a eyesore, in my opinion.

On a related note, the coniferous forests of the mod minus the snowy ones have all the plains type village and not the taiga ones, despite the biomes themselves being taiga-like (Repurposed Structures spawns structures related to taigas) but this might be intended.