Killing rabbits in one hit with fire aspect enchanted swords sometimes makes them drop raw meat

When i kill rabbits with a sword that kills them in one hit, they sometimes drop raw meat instead of cooked.

What I expected to happen was...:
Dropping only cooked meat

What actually happened was...:
Dropping raw meat instead

Steps to Reproduce:
1.  Find a rabbit or summon one with a command
2. Kill it in one hit with a fire aspect enchanted weapon
3. Repeat from the beginning for a couple of times 

4. You'll see that some of the rabbits did drop cooked meat and some others dropped raw meat instead