When you put your inZOI folder under Documents to a save place you should be safe.
Did you also check the blueclient folder and cleared the cache? I often read even when you remove/disable mods, there can be remains of them, so a new install maybe would be a good idea.
Ah, and do you have manually driving enabled? Maybe it’s on automatic and the game already drives the car even though it’s not moving yet and therefore the other Zoi can’t get in?
Or maybe interrupt the driver from getting into the car first and let the passenger sit first?
Is it only the passenger seat or the seats in the back too?

