Could you send a repro where I can drive the car through some rubble and take a closer look? You can DM if you prefer.
From Physics Best Practices:
When parts are highlighted red, they are being simulated on your device, but you do not own it. This is generally just a transitional state used to avoid instability. The parts become simulated for a frame, then are corrected by interpolation.
If the parts are staying red when driving through and not eventually matching the color of the car, there could be another problem, but I’ll need to take a closer look.