Lava drops uncooked food

Steps to Reproduce:

1. Download and open the attached world
2. Activate the dispenser to spawn a chicken
3. Wait until the chicken dies from the lava
4. Check the drops in the chest

Observed Results:
The chicken drops raw chicken.

Expected Results:
The chicken should drop cooked chicken.

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Original Description:
Made and auto-chicken farm in survival. Drops uncooked chicken rather then cooked chicken. Recreated in creative mode and used spawn eggs in dispenser with same result. Adult chickens also take long time to register damage by lava.