Piercing Gaze and Duo/Invis

Piercing Gaze won't detect someone who is in duo unless they are in the same room (not in the area - this is working correctly). But if someone is duoed and invis, I see them in the area as "an invisible figure" (even with detect invis up). Related (smaller) issue: If someone is hidden and invis and I have detect invis up, I still see them on where as "an invisible figure".