Getting out of vehicles seems sorta bugged for AI ATM.
In MP, sometimes the only way to get AI to disembark now is to have them eject also.
ie;
Say you are draggin a couple of AI with you in a Stryker. You order them to disembark the "normal" way, sometimes the just sit there.
So, I have had to use action "eject" instead. It works everytime.