My planet generated without any nuclear scrap anywhere on the surface on seed 840169345 so Im completely unable to progress or return to my Space Platform. Please help, what should I do now?

Fixed it in my save by spawning two 10M patches myself after hours of battling this trying to make it work.

Resource spawner overhaul is installed?

Yes, RSO is the problem but it is one of the basic mods that nearly everyone uses. It has documented ways to make your mod compatible with it so I'd recommend you having a look at them. (Also you even list RSO as a hidden dependency in your mod)

For anyone encountering the same problem, this script spawns a ~10M circular patch of nuclear scrap at -25, -25, you can repeat this for the other two resources at -25, 25 and -50, 0 or sth. the entity names are "cerys-nuclear-scrap", "cerys-nitrogen-rich-minerals" and "methane-ice":

/c local surface=game.surfaces["cerys"];local center={x=-25,y=-25};local radius=12;for x=-radius,radius do for y=-radius,radius do local dx,dy=x,y;local d=math.sqrt(dxdx+dydy);if d<=radius then local f=1-(d/radius);local n=math.random()0.3+0.7;local amount=math.floor(10000ffn);if amount>1000 then surface.create_entity{name="cerys-nuclear-scrap",amount=amount,position={x=center.x+x,y=center.y+y}} end end end end

In my Discord, I have long warned about planet mod compatibility issues with RSO. Although this mod was indeed popular at times a large majority of Cerys users do not use it. The general warning is for mods that make far-reaching changes to other content mods without consideration of how they work.

On Cerys, RSO ‘compatibility’ (disabling RSO) was implemented in Cerys as described by the RSO docs several months ago. I am guessing the present issue is due to a bug in RSO.