OLD TV Filter for GameMaker

Hello, I'm having some problems with the shader (which by the way is excellent). The shader works very well and such, but, for some reason, nothing that was designed in the game's GUI, like text boxes, lives and etc., captures the shader, stays the same, without effect, or is simply not drawn, like my transitions between rooms. I really like this shader, and I would VERY like to use it in my games, so if you can answer me, I'll be grateful, <3 (sorry for my bad English, I'm BR lol)

Is there a way to make this work with Pixel Pope's palette swapper? At the moment colours become wrong when you change palettes.