Would you send the world for test? I haven't really done anything to that code so this is puzzling. There was 2 versions within a day now because the 1.18.6 (also released yesterday) was bugged in different way. So be very sure you have the .7, not .6.
Edit: Also any mod that adjusts the car angle even slightly will cause snapping to temporarily halt. I could imagine some car physics mod could do such a thing, although it might work sometimes. Even a difference of 0.001 in angle from other sources is detected by VS. It is to let player turn the car too and not fight against it, but this system is still the same as it's always been.