Hello here is a video to show what is actually happening in my case
I did everything necessary to make a good car rig for my vehicle in blender but strangely the car flies away when the kinetic and the default bodies touches themselves. I previously done a vehicle on Blender but this one worked and the default and kinetic bodies were touching themselves. Also in the new car I’ve made the Wheels are not disappearing when simulating the physics assets like they should do according to the previous version of the Vehicle.