my food only drops through immediatly if i throw it at a bad angle, which i dont cause i stand on the grill XD. The only other time it falls through is if im away while it cooks
For example, if im out of my camp hunting at the same time that my food is cooking, when it cooks it will fall right through and into the campfire.
I dont mind though because while cooking food i usually water plants or mine a closeby rock. Its a rare occurence for me and i may be the only one it happens to, considering my luck