Cars - Matra-Simca MS650 - Weird graphical glitch on front and rear bumpers

There’s something on the front bumper (from front wheel to front wheel) and rear bumper (fixed wing included) that messes with the shadows in the spinner, and causes the front bumper to take on a very low-poly appearance with the ‘mouth’ of the car effectively removed visually. Additionally, the shading on the rear wing persists outside of the paint booth, and causes the fixed rear wing to appear darker than the adjustable rear wing, despite having the same colour vinyl on both.