i recreated this thing twice
the first time i did not have time to make a screenshot, red tires only blinked for me
the second time i taked a screenshot, but the tires were white (see attachment)
Instruction:
make a race you and 1 AI. Spectate AI (or your car), minimize the game / alt + tab, do something else, preferably'll play another game. after some time back to LFS