Skid Marks Appear in Mid-Air After Braking at Platform Edge

Steps to reproduce:

1. Create a new Unity project
2. Open the Package Manager
3. Install the *com.unity.vehicles * package
4. Select the Vehicles package and open the Samples tab
5. Import the Advanced Vehicle Sample
6. In the Project window, open the AdvancedVehicleScene
7. Enter Play Mode
8. Drive the vehicle to the edge of a raised platform
9. While the vehicle is partially or fully airborne, press the brake (Space)
10. Observe the area behind the vehicle as it leaves

Actual results: Skid marks are drawn in mid-air even though there is no surface beneath the tires

Expected results: Skid marks should only be drawn when the tires are in contact with a valid surface

Reproducible with versions: 0.1.0-exp.10 (6000.2.0b3)

Tested on (OS): Windows 11