Barrier Texture vs. Stained Glass

I do not know if the Barrier texture is supposed to behave this way or not, but I find it a bit strange that it is being drawn behind all of the Stained Glass blocks. This "problem" do not occur with the regular Glass Block though (see picture). I would not consider this as a bug, but I could not change the issue type. It just says "No Matches" when I try to see the list of issues.

Thank you for your attention.
-Tor-Einar Kure