I don't know if this has been brought up already, but I don't remember seeing it mentioned here.

For a while now on Identify's server, there have been occurring lots which simply are not instantiated, and appear as impassable gaping voids in the world. They only seem to appear in and around industrial areas, usually come in lines of 2-3, and seem to favour roads (though that may be observation bias).
The server didn't have them at the beginning, and they seem to appear or change position over time - I think after server restarts. Prior to the latest world reset, I had a base that got lost in limbo in this fashion.