Ahri e bug

the reason for this is because all types of hard CC stops yasuo dash, even despite ahri's charm being changed.

Uniquely, all forms of movement-inhibiting crowd control (airborne, snares, stuns, suppression, etc.) will interrupt Sweeping Blade when they hit him - rather than waiting for him to complete the dash. This is contrary to all other dashes, which are only interrupted by airborne-type crowd control effects.

from the wiki

So do Stuns, Taunts, and Snares.

That's a difference between Yasuo's E and other dashes; it isn't a bug with Ahri's E.