Extraction waypoints gone in mission map

[(PSN)Morphologia]

I've had this happen about 1/3 of the time (on a good day), regardless of the type of mission, the extraction waypoint isn't on the map (mini or expanded/fullscreen).  The green icon is visible hovering in the UI only as a general direction on the terrain; the marker is on extraction and somehow visible in that general direction but does not indicate which door or path to take.  It's like a shiny green Bat-signal that I can somehow see on a straight line-of-sight, through solid terrain, across however much of the map remains.  I end up having to fumble through dead ends before finally finding the path that leads to the exit. On other occasions, there's no extraction waypoint at all and I have to keep taking wrong turns until Ifind it.  This happens in groups or when I'm solo, can't really pin down a pattern.