Moria glass bug

[Slowlex_]

At the last days, I worked a bit in Moria. Then I noticed that the glass panes sometimes don't have a texture from the down side.
This happens when you use these small pillar glass panes and connect these to any corner or when you place them on top of eachother.
Here are two examples, so you will understand it a bit better.

 

[Eriol_Eandur]

I'm quite sure this was made intentionally by Despot. You can't make border of a texure diagonal thus a downside and upside texture would not fit perfectly with the other faces. It's the same problem as with the large diagonal blocks.