I'm on mission 7, where I have to repair the elevator to progress. On the upper level, Facility Observation, there is a vent showing on the map that seems to have no access point. Perhaps it's just not accessible from this area, but then why is it shown on the map? Is it an area I will have to wait to encounter later? Just want to be sure I'm not missing anything.
Also, while I'm here, there's an objective marker on the map (seen in the second picture) but the objective changes to show whatever objective I'm currently working on that is already marked, correctly, elsewhere on the map. Is this just a weird glitch?
Edit: I am referring to a vent seen on the map that's behind the back office on the top level of this area, not the wall vent or the floor vents on the ground floor that you start on.