resource pack atlas broke as of 1.21.5

so im trying to make an admittedly insane resource pack that adds an individual custom block model for every color, and a big part of what made it work was splitting a giant png of every color into individual pixels and using each one of those pixels as a different texture
I got as far as figuring out i can just get a block with a custom model on it (which also broke but works now) and now just the textures itself is broken. I will gladly drop what im doing to give a demonstration on what it's supposed to do if it's not clear.