Challenger Ahri lost her dance sound effects.

Plain and simple.

The skin shares the same base dance SFX as her base skin, Midnight, Foxfire, Academy, K/DA, and Prestige K/DA. However, those skins have the sounds, Challenger does not - it is completely silent.

It's just a minor issue, and I assume anyone can replicate it. I've noticed it for a couple patches but didn't think I'd need to say anything.