So, I can see through just one section of wall if I go under the E5 stairs on HPG and zoom all the way in. Same goes for the D4 wall if you go right up against it. Glitch ends under the D4 staircase. May want to fix that as I could lock on without a proper visual from the E5 spot in-game. Only found the D4 spot while testing for other locations you would want to be aware of.