Hmm, testing Maraxsis by itself, seems to work perfectly fine; testing with base All Planets pack, and it definitely doesn't work. Testing with All Planets Lite, and it works just fine again. That narrows the problem down to one of the All Planets-exclusive planets: Muluna, Naufulgle.., Planetaris Arig/Hyarion, Tenebris Prime, Tiberium, Metal and Stars, Dea Dia System, Terra Palus, Janus, Rabbasca, Linox, Khemia, Arcanyx, Foliax, Virentis, and Muria.
I'd be much more willing to drop whatever is breaking Maraxsis, before dropping Maraxsis, since most of those are relatively new/WIP, still in beta/active development, unmaintained/abandoned, have other issues, or don't add unique content (though only Naulfulgle.. falls into that last category imo)
I'll try testing these one by one to see if it's just one specific planet mod, or a combination of planet mods that breaks Maraxsis
EDIT: Narrowed it down to Janus (though it is possible another planet mod might also cause the same issue), reported it to them on the mod portal
