"Unfortunately or fortunately i found a conflict of settings in the shader. With low scanline saturation the ‘PVM colors’ aren’t applied or applied very weakly. I needed to fix this.
In the process i also decided to make the shader even better. I wasn’t completely satisfied with some types of filtering, as it turns out, using an even number of pixels fixes many issues with the shader. I’m also very pleased how the anti-ringing, mask reference color and scanline color turned out."