I played this map in Config 0 and discovered that there is cover behind the open gate on the left, but not on the right.
Later I played the same map in Config 1 and discovered that it has the same problem flipped (Cover on the right, but not the left).
The marvels of Photoshop allow me to show you the movement cursor displaying a shield (full cover) on the left, but not showing a shield on the right.