you se mocha removal can be usless when it comes to scene that has sun light affecting the object it can make the mask stand out try it.
and to fix that there is a way around it with vfx.
the tracking the whole scene this is how to do it
track the car , when it comes to near when the object is almost out of screen , add another spliner in front of the car so the current spliner does not move out of place.
this is the best way to do it am sure you dont know this otherwise u would have said it.