hm, after some restarts, I notice that it happens much more on rail world, normal SE preset gives normal bitter, but if you move far enough, eventually you find different race.
Not sure if the spawn has changed, I kind liked when we could just have them mixed together, now they seem to only spawn in specific race per bases, even though I have the "Enforce temperature" disabled.
You move, and their is only like big chunk of protoss, rarely some terran, saw just one or two space guys, and no zerg.
Maybe cause SE add the alien biomes... gonna do some more experiment.
I had mainly played with erm and angels, first time experimenting with SE