I have found 2 bugs, one is compromising the pvp/pve the other one is really minor.
Major one : when going prone on a non straight floor with a gun (m4 with just an acog / mosin without a pso in this case) your crosshair is no longer representing the point where your gun is aiming at. if you hip fire its doesn't matter the bullet will go where your crosshair is aiming at BUT if you try to aim with the scope you are not going to aim where your crosshair is pointing at. Sometimes when leaving prone the buged position is still there.
You can fix the bug by going prone and aiming straight into the ground, that seems fix the bug.
minor one : while eating a canned tuna in prone position there is a sound bug, you do no longer ear the eating sound but the swimming sound (yep thats weird).
(video + picture in the description).