I'm not 100% sure it's a bug but here it is:
On Norhoop island, between Karapyth station and Karapyth Station TP there's a spot of light/assault Nuimqols. Because of land topography it is only accessible with light robots. The spawn is tough to handle in lights but with enough people I guess it's doable.
Now I think it may be a bug since the other light/assault spots around (Thelodica/Pelistal) do not have this restriction and can be accessed with assault robots.
I may be wrong tho and you should then tell me to suck it up and htfu