[GAMEPLAY] Fiora - Riposte another Fiora hitting Vital makes Vital disappear

On Fiora, when you Riposte(W) another Fiora hitting a Vital, the Vital disappears for ~15s. I have tested it with other champions that have invulnerability and spell shields such as Kayle and Sivir and it works fine. It seems that this bug only happens when its Fiora vs. Fiora.

1. The first Fiora Riposte(W)
2. The second Fiora hits vital with auto or a spell

I have managed to reproduce this bug 100% of the time

With Autos With Spells