Maybe a CSP settings thing ? Or rather a CSP triple screen thing. Several things in CSP are not working on triples, but this is a strange one. Showroom, previews, looking from the outside on track, all show the star as it should be.
Cockpit view: only the chrome circle (like it was before installing).
I had to go back and double-check, but it works fine on my end. So, CSP or screen setup seems plausible. Had a similar problem a couple of updates back where some transparent textures became white or chrome with certain Extra FX options enabled.
@Esteve Massot Drop the texture into whatever skin you want to use it with. If you're unfamiliar with AC mods, and folder structures, there's an excellent how-to video on the basics pinned at the top of the AC Mods forum section.