[DIANA GAMEPLAY BUG] In Summoner's Rift

While playing a bot game for my daily win, I was attacking an inhibitor and noticed that the third attack which triggers Diana's passive aoe burst, did not deal extra bonus magic damage to inhibitors while standing still and continuously allowing her to auto attack.

However, when I tried to auto attack, side step, auto attack again, side step, and auto attack to trigger the passive aoe, it dealt the bonus magic damage to the inhibitor on the third hit as if I had struck an enemy champion or minion (or tower). I've only tried this in Summoner's Rift, so I don't know if it affects other maps.

I realize this quite minor, but I felt like reporting it since an extra 250 damage to an inhib on that third hit adds up pretty quickly when she has some attack speed behind her.

Anyway, thanks for taking the time to red this, have a good day.