VR Replay: dust trail turns black

The dust trail kicked up by the passing car in VR replays suddenly turns from brown (good) to black (bad). I know that the historic rally cars didn't have the cleanest combustion engines, but I am positive the weren't using coal-fired steam engines.

Also, while I appreciate the serene soundscape in VR replays (with birds chirping and all), I would prefer to actually hear the engine of the passing rally car.

Reverb G2, 3080 laptop, AMD Ryzen 9 5900HX