Hey I know this thread is around 5 years old, but I was having the same problem recently while trying to remake Diamond from BOCW / BO6 and figured out that the Diamond camo doesn’t actually have a color map for the main Diamond part. It only has a Spec & Normal map, while the alt textures, which are the Gold part, actually have a Color map and all that. U could make it work by making a mod that changes the camo so it actually uses a Base Color map, but then u wouldn’t be able to use it on servers unless that server had the same custom Diamond mod as well. So it kinda sucks.