The factory wheels on the Mazda MX-5 Cup (ND) do not have any Paint Groups, despite them clearly appearing on the wheels when any custom paint is applied
Custom colours themselves are mostly broken as well:
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Semi-gloss and Matte colours appear as matte gray on what seems to be Paint Group 1, correct on other parts of the wheels (Inner Barrel, Paint Group 2?)
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Two-tone colours always appear as two-tone matte, except for just the aforementioned inaccessible Paint Groups