(Gameplay)- Dragon resets even under Agro.

Hey so i do not have an exact link/screenshot for this, but dragons agro seems to reset in mid fight if you drag it out to a distance where it would normally keep attacking you (right at the entrance of the pit). I noticed this in my ranked 5s game last night, and this morning I was watching Nightblue3 and saw it happen to him in the middle of his fiddlesticks drain. He commented on it was wierd that it reset, and I didn't know if this was something in the patchnotes or not, so I decided to post on the forums. Let me know what's up!