Mobs with "dead" sounds play the wrong sound if killed on lava

If you push mobs with "dead" sounds to lava, they will eventually die, but will play the wrong sound when dead

What I expected to happen was...:
The "dead" sound would play when the mobs died

What actually happened was...:
The "hurt" sound played when the mobs died.

Steps to Reproduce:
1. Spawn a mob that has a "dead" sound (e.g: spider, pig, etc.)
2. Push it to lava and wait for it to die
3. You'll hear that when dead, the mob plays the "hurt" sound rather than playing the "dead" sound.