"Immortal" holes
I found very old holes on Tib 26, here 582:657 (2 pieces near this point) Forgotten does not seem to rise the density... There are some more, but they are covered by players now.
Forum Discussion
I've looked at the coordinates, it seems there is indeed a blind spot there in the Forgotten Territory. Until the surrounding bases are killed and new ones spawn, so next time those gaps might just disappear. Nothing I would consider a problem as it seems to happen only rarely.
