[GAMEPLAY] CC Effect of Charm wears off when Ahri Dies
This bug has been around since at least patch 7.24, and perhaps before that.
If Ahri charms a target and then dies while the projectile is still in the air, the Charm effect wears off, but the slow persists. It's difficult to reproduce in practice tool as you must die. So I do not know if this is only if Ahri is killed by the target that charm hits or if she dies in general. However, this happens quite frequently, and as with the video shown below, it can make or a break a teamfight.