I was on my survival server trying to get food with my fire aspect sword. I've slain cows, pigs, sheep, and chickens. All of which dropped cooked meat upon death. As I made my way into a colder biome, I found a rabbit. I killed the rabbit, only to find that it had dropped raw rabbit. At first I thought it may have been a one time thing, so I located another rabbit, tried again, and was met with the same result. It seems as if rabbits are not coded to drop cooked rabbit upon death with a fire aspect tool. I do not know if this is intentional or something that has been forgotten to be implemented.