I'm using Simulacruis version 0.4.2 on factorio's latest 2.1 build (2.1.20, build 87512).
The soil type I was using was the natural jellynut/yumako soils, artificial soils, and overgrowth soils, with their respective seeds
Is there any way to export a mods list? The only other mods I have that I'm aware of that modify surfaces are "Apia-Carnova System", "Maraxsis", "Factorissimo 3", "Creative Mod", "Any Planet Start", and possibly "Rampant, Fixed". I do have "Quality Seeds" and "Quality Trees" as well, but those modify seeds, which have been fixed, not planet conditons.
If others are able to plant stuff, I think it might be a mod setting conflict somewhere