So I was on my server and was working on a build, and I look at another player that is holding colored glass. The player is standing in front of water, and I can see the water in front of the glass. Also happened when the player was standing in front of glass, the color of the placed block went over the color of the held glass. Dunno if this is a bug with minecraft or the resource pack, but I never noticed it until after I applied the resource pack.