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.