I think this is an animation issue?

Anyways.
VERY SPECIFIC STEPS TO REPRODUCE -- if you've had this problem any other way let me know.

I've only had it happen about 3 times. It doesn't do this with your weapon drawn or you're not walking. I tried it on passenger side at least 12 times and no luck reproducing it there (that's good).

Of the 3 times. Twice I was walking into the door on a bit of an angle towards the back end of the truck from the front. The 1st time I was walking straight towards the door.