Something I've noticed now is that when i select any camera view of the dummy that isn't the driver, so FR passenger and rear passengers, the camera is glitches so it's inside of their head and I can't see.
I've had some glitches when using mod cars when I used the universal seatbelts the dummy sometimes at high speed impacts just flies off the seat like the dummy has no seatbelt.
The seatbelts are not unbreakable so on high enough speed it will fly out. I could make them stronger if they are too weak for you. Or even give them adjustable strength.
i just noticed that the front seats disappear when i select "Use if dummy falls through seat on mod cars" on some mod cars before after (also reseted the car)
it still works but with invisible seats appearing you might wanna give them a warning when it comes to old mods but i dont think its just old mods since i also have that problem in gavril gpv