When having no weapons equipped, then equipping a sword, I sometimes have an issue where none of my sword abilities actually trigger although it tries to play the animation for it on my screen.
I have asked other users if they see anything, and they do not - they only see my character walking normally or standing still. They do not see me triggering abilities.
I am able to recover by either swapping weapons or using a standard light/heavy attack.
My attacks do no damage ( as seen in the video ) but the tracking still tries to apply.
did you run Steam’s local file verify? Seems only con-current to you so sounds like a bad file/s possibly. I haven’t read/seen any post/s describing same issues so that’s why I suggest that