I just checked it with the LATV4 and the T-28 and it seems the updates didn't make it into the early access build :(
For now this is how it works; no matter where your gun is aiming (both driver and gunner) you always hop out from the left of the vehicle. The only thing that changes is where you're looking when you get out. So as an example, if you aim your gun to the right, you'll still exit from the left but you'd be looking towards the right. If you aim your gun at the rear, you'll exit from the left while looking at the rear. video example of the T28
Yeah I'm pretty sure I fixed this already, but I'll take another look just to be sure.