Here is replay where you can reproduce it.
Switch to my car, and do constant SHIFT+TAB, TAB, SHIFT+TAB, ...
although it isn't so noticeable as on youtube video
That's poorly could be considered as bug,it's more lag related I believe... When you switch to other car,quite often you will see in first half second car just move straight just like it has quite big ping.
Also lag happens when half of car out of textures. Replay attachmented.
I noticed tyre on the track in the end of the video after comparing with/without clutching between players ( Tab/Shift +Tab ). Screenshots attachmented.
One time strange thing happened to me. My car was opposite of the wall and I warmed tyres. I pressed Tab and then Home. I didn't release gas throttle and when I pressed Home, I noticed that my car passed through the wall. It was a layout so the wall was custom object Barrier Long. Unfortunately I haven't got that mpr =(