I lost a very nice weapon thx to that and I remember this happening a month ago when I first started and was testing buttons. I havent tried throwing something upwards but downwards. Its not nice to have a "throw" button when its like a "delete" button.
Last time it happened was in the main airfield on 1 of the strips I think. AKM disapeared on the floor. I also threw a grenade and it didnt explode after arming it.. Or it exploded under the ground and we heard nothing.