When exiting a vehicle, either as driver or passenger, a gun malfunction is noticed.
On exiting everything appears noprmal. The gun still fires, but projectiles no longer injure/kill the enemy*.
The gun cannot be reloaded.
The gun cannot be dropped.
The gun cannot be swapped (from #1 to #2)
The workaround, is to re-enter and exit the vehicle, until the gun functions as it should.
Sometimes after exiting a 2nd time, there is still an issue, and the gun is no longer visible.
Sometimes, after exiting the gun functionality is completely restored, and on occasion*, the previously shot at targets register injury or death.
This was first noticed in 0.98x, and is still present in 0.99x