I have tested this many of times i noticed if you drive in to the mission you hit 10000 de-sync and the ai just stop moving Only effects the person that was in the vehicle not the hole server
Hmm if anything it seems like a server resource or player bandwith problem. Try and do it again with #monitor 3 on and see what those values read when you drive in.
I have tested this many of times i noticed if you drive in to the mission you hit 10000 de-sync and the ai just stop moving Only effects the person that was in the vehicle not the hole server