no, ive actually seen it too, a lot of times.
one time i spawned on a squad mate, and thru the spawn (or DEPLOY) screen i could see him normally run around.
when i was in game, behind him we was pronong on the ground totally crippled, but moving and also climbing over little walls and fences.
well, the dead body actually just hovered over them xD
One time, while I was sneaking up behind them (I was an attacker) I spotted two dead bodies on the floor, i ignored them but then suddenly one of the dead bodies moved a little bit, without freakin hestitation I shot body that moved and the body next to it just incase, in the end - DOUBLE KILL - BOOYAH.
In tunnels, I end up spanking a few rounds off just to see if any invisibles are down there. On one ocasion there was... But as I couldnt see them they killed me dead.
Apparently, the dead body is where the killcam goes, but hit detection is on the invisible player walking around.
That just does not make sense.
I always get confused by enemies that are prone.
Running in to set a charge, see body, "oh, dead body", get shot, pull sad face.