Fiora not able to parry Aurelion Sol's CC [GAMEPLAY]

For some reason, during a game tonight as Fiora mid vs Sol, whenever I tried to parry his Q, the parry animation would go off, the Q would explode, but then I would still be stunned after the parry. This happened consistently during the game.

Also worth noting, whenever he stunned me, regardless of whether I parried, the word "Stunned" would not appear as usual.

It seemed to only affect interaction with Sol, as I was able to parry Blitzcrank's hook a few times.

The bug was present all game, so I do not know of any steps to recreate the bug. Sorry about that. :/