Animal Death through burning (Don't talk to PETA)

Animals dying through lava or burning doesn't drop cooked items,they drop cooked items when they burn and keep burning until they die BUT when they die immidiently after going through lava or being burned,they drop raw food which kinda ruins my chicken farm a lot.
To recreate issue:
1) Burn chickens so they instantly die and drop raw food instead of cooked food.