Ive started my first Lost Alpha campaign (after years of not playing stalker) There is an addon called "mutants are not tied to gulags" or something like that, that will fix it for the mutants. As for the NPC's, some stay in their camps most of the time but I also see many NPC's just wandering around.
You should try it again. (I'm not playing 'extended' though, just 1.4007 + LB's compilation)
MarktMan
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