spawn locations and interloper

[MaiveTheSheep]

So i think this is the correct place to ask but for spawn locations I'm told 2 things about interloper
1. cant spawn in mystery lake, coastal highway, and mountain town
2. much less spawn regions in each place

are both statements true?
and if the latter is true, then does doing custom difficulty with interloper presets include the more limited spawns?

I'm asking cause I came up with a challenge idea that no matter difficulty can make you a better player in one way
but there are (with those less spawn regions in interloper) 2 ideal places (forlorn muskeg and bleak inlet) and 2 might work places (pleasant valley, desolation point) so if the custom doesnt have more limited spawns in those regions but there are limited for regions in regular interloper i'd like to know what are the limited spawns for those regions
because while i have tried this stalker for ideal ranges, i want to see if doable (even if not by me yet i have enough skill to know if doable after a playthrough) in interloper