Maybe I'm missing something, but to progress I seem to be required to craft nanites. The Factoropedia says they are crafted in Microgravity Assembler. In order to be able to build it, I need to research the "Precursor machines" technology. But it is locked. I need to first craft nanites.

So I need to craft nanites before I can craft nanites?

I'm using the "Enable All Planet Mods" mod, it is interfering with the research tree, or am I missing something?

UPD: I landed on the "planet" again and it turns out you are required to dismantle one of the assembler there. You can't use it before, it only produces some basic components, but if you dismantle it and place right again, it turns into a capable assembler. Weird mechanics, but ok.