yes, those anomalies at npp are real strong, impossible to get out, or only with god mode and a few minutes of trying...
we did not add them, they are vanilla things, but in vanilla ppl doesnt have tim to look around. in 1.2 we removed a lot of anoms, since we hate them, even if the levels are somewhat big, the anoms reducing the explorable areas...
besides that we found many cool items on that npp level, many outfits and things hidden, maybe gsc thought that in vanilla we have time to explore with the 5min timer and 200000 angry monoliths.
my favorite levels: pripyat and stancia2 (and deadcity hehe)
what i really hate: rostok (totally linear and boring level, could be cool if they opened it up)