Aatrox autos

I am not sure if this bug has already been introduced or not, but I have been playing Aatrox quite frequently and he seems to not auto sometimes when the command is given. I am not sure what triggers the bug, but he just stands there momentarily before autoing. I noticed it more than once. It may have something to do with Rageblade, but I am not sure (I say this only because one time that stands out is when I had Rageblade). I will have to do some more gameplay to find the source of the problem later.

This video is another player that experienced the same bug (Aatrox not autoing despite the command being given [one such instance occurs ~10;18 in the video]). https://www.youtube.com/watch?v=ociYGgG3eH0

(Note the player in this video did not have Rageblade on Aatrox during the time that I have given above, yet he did experience the auto bug).

Has anyone else experienced this? What is the cause?

Like I said, I will try to figure out more about the bug later and post more of my findings here.