@EA_David the cars I've used and experienced the issues with are:
Nissan 180/240sx (starter car), community wrap full visual mods. Crashed during handling race, fine during drift events.
Rx7 full rocket bunny kit, he didn't crash for an hour until I threw wheels on it then boom right outside the garage.
06 or 07 sti, full Subaru wide body kit, wheels and paint crashes first race. Lost the body and paint and it's been fine since.
93 skyline gtr. Full bee r kit crashed with wrap. Ditched wrap and it was fine.
17 GTR. Full rocket bunny kit, rotaform wheels and crashed in 3 races. Front bumper also disappeared completely.
Hurracon (first one unlocked) full everything Lamborghini racing kit and wing, rotaform wheels, wrap and it's been perfect for 6 hours.
All bonus cars work perfectly.
Otherwise other than the notifications being way to opaque its been a great game. I just want to modify my cars