But at this moment they haven't made a fix public yet. The current situation is that EA has said that they are looking into fixing this problem in their code. Unfotunately with the result that this has broken the use of non-standard hair colors. This problem is caused by EA trying to fix the matching of eyebrow colors with hair colors.
The hair colors can't be changed anymore. The november 2018 Sims 4 patch has unfortunately broken a lot of cc hairstyles. After installing this new patch, all CC hairstyles should be functioning correctly again. It's no longer needed to use this workaround fix. Edit: EA has now released a patch for fixing the hair color problem.
