Got it now, and thanks for the clarification. Here is mine:
The ammo crates drop through ALL of the maps, every map. It doesn’t matter what map you’re on, if you drop one in the “wrong” place (although, the wrong places aren’t marked as such, like with a sign that says, “Warning! Do not drop ammo crate in this area!”), it will drop through the ground, or floor, or bridge, or road, or grass - - you name it, it’ll fall through it.
That said, they don’t drop through every place, on every map. Drop them on a bridge, they will fall through it. Drop them on the second or third floors of practically any building (or perhaps I should say, randomly), and they’ll fall through the floors. Drop them on the ground, and they’ll fall through the ground and disappear (or more frequently, perhaps, fall partially through so that only the flipped - up top is visible) . Drop them on a boat, say “bye bye” to them.
Drop them on a rock, whoa! There it is. Drop them on the floor of the hangar in Aerodrome, OK, it only falls through about half-a-crate or so, yeehaw! Half success. A tank can drive on the cement, but an ammo crate falls through it? WTH?
And yes, you can get rifle grenade refills from crates, but hand grenades? Nope, they’re not in the crate. Someone forget to pack them correctly?
Seriously, DICE, what is the problem? Why can’t you fix this? Stop designing new and useless face-paint, and start fixing some root game play issues.