Stuck in Autoattack / can't Attack

So, I experienced this bug for a long time now and since I never saw anybody talking about it and it never got fixed I begin questioning myself if it's even a bug and maybe a problem with my computer, settings or connection.

The Bug: I guess it pretty much happens when you try to last hit a minion and for whatever reason the minion gets killed right before your projectile would hit it. After that you are impossible to auto attack another unit, until you moved/changed your position. And it also feels like it has a short delay until you can do even that.

This is really frustrating and anoying since it leads to even more missed minions or bad situations since your opponent can freely attack you. And most of the time I get confused because Im stuck and it takes a while before I notice what I have to do to be able to attack again.

It mostly happend to me while playing Kalista and Azir. Azir is a little strange in that sense.. His Soldier seem to get stuck even when his target just walks out of range right in the moment when he would hit and only that soldier cant attack until you move, attack with another soldier or after a short duration since it seems like Azir's soldier rewinds his animation pretty fast and then takes a moment to recover.

I hope Im not the only one with this problem and anybody can help me resolving this issue. Cause its not happening that often but still often enough to be annoying. Thank you.