[Gameplay Issue] Xin Zhao Three Talon strike and Pantheon Aegis protection

I've played a game yesterday where i was playing Xin Zhao against Pantheon top. In common sence when Aegis Protection is on Three talon strike get blocked and Xin lose his bonus damage and 1 strike. However, whenever i was attacking Pantheon during his Aegis Protection, with Three talon strike active, it wasn't consuming the auto enhancer and was activating 1 auto attack after Aegis got popped off.

How to reproduce: Step 1: Pick Xin Zhao into Pantheon Step 2: Wait for Pantheon to have Aegis protection activated Step 3: Use Three talon strike on Xin Zhao during Pantheon Aegis Protection Step 4: Realize that it doesn't consume his Three talon attack until Pantheon Aegis Protection is down.

Thanks for reading and i hope you guys can fix the issue.