Every once in a while Ive come across a game where the developer would fix a major issue and you had to start a new game for it to take effect . I know its inconvenient but if its not fixing for you even after you get new vehicles then you may need to start a new game. Like I said sometimes the update doesnt work unless you do.
Well there goes my many hours of collecting stuff. Was wondering why my vehicles were still missing after the update...