This issue is almost identical to the one found on the 2017 Mazda MX-5 Cup, where Normal Colours appear as metallic (just add those to the game separately at this point), and Semi-gloss and Matte colours lose their saturation. This time Semi-gloss becomes slightly metallic though. Inside Barrell, however, always stays as the intentional, correct colour.
You have all of these colour types in the game unintentionally, why not turn them into a feature?
