When a mob dies, the death sound is played twice.

When a mob (passive or aggressive) dies, it plays its death sound twice.
Does not affect entities such as snowballs or arrows.

[How to reproduce]
1) Spawn in or Find any mob
2) Kill the mob
3) Listen carefully

You can hear the glitch the best with villagers or pigs.
Device is Samsung Galaxy Tab 4 with MC 0.13.0b2