Missing Axolotl Mob Sounds

With the introduction of the axolotl mob in the latest beta, i've noticed that many of the distinct sounds for this mob are currently not available in the game. 

 

Expected Results 

The axolotl mob plays many of it's unique mob sounds in game. 

 

Actual Results 

The axolotl mob lacks some if not all of it's unique sounds in game. 

 

How to Reproduce 

1. Spawn an axolotl mob in survival. 
2. Listen