I have a bright orange helmet, and on day one it really did reflect with that design. I noticed it because of that. Maybe it uses the default helmet, but with the base color of your design?I recorded some gameplay footage in VR two weeks ago before the update doing laps in the MP4/4 and could not see my own helmet in the reflection. No changes regarding that in this update. Not sure about other cars though.
Here's a screenshot of the reflection from two weeks ago showing the generic Gran Turismo helmet:
View attachment 1245228