Confirmed, though it's been like this since at least 1.2.5 (possibly since the Ender Dragon was first introduced). Since the Dragon has a death sound, it should not make any other hitting sounds when dying.
Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.
Confirmed, though it's been like this since at least 1.2.5 (possibly since the Ender Dragon was first introduced). Since the Dragon has a death sound, it should not make any other hitting sounds when dying.