Artificial boundaries won't show up until you are way beyond them

Just had this issue again. Many maps got “improved” by cutting off some parts. Usually this areas are redish on the mini map. Now I had them did’t show up at all until I was way inside the forbidden zone… Is this normal on some maps or a bug, or even new game mechanics?

It depends on the map and mode I’ve found. I’ve seen it on Stalingrad Domination, where if you spawn E1, and head to C, if you skirt towards the bottom of the map, you don’t even see it until you enter it. You would assume you have some area to move to the edge but it’s much farther up.