[GAMEPLAY] Sion's Joke/Taunt/Laugh audio not playing

So, while playing Sion ( ) in a bot match for my free IP of the day, I noticed something late into the game. Whenever I laughed, taunted, joked, etc., the audio wouldn't play. Sion would perform the action, but would not make a sound, no matter what I did. This was rather curious, as he did make the proper sounds before minions spawned as I laughed before leashing the jungler. I tried again in another match, and the same thing occured; I could make sounds before entering combat, but after I entered my lane (top) and started farming some minions/poked the bot champs, if I tried to do any of the things mentioned above, he would only perform the actions, and not make a sound.

1. Taunt/Laugh/etc. before combat starts (with successful audio from taunt/laugh/etc.)

2. Initiate combat with minions/champs

3. Taunt/Laugh/etc. after combat (no audio from taunt/laugh/etc.)

I understand that this doesn't affect gameplay at all (except being able to laugh at your foes), but I love Sion's over-the-top bellowing laugh and wish to taunt people with it. If this could be fixed, I would very much appreciate it.