I absolutely can't find the final heart in Wayfarer Foothills. I've looked everywhere, both in map view and character view. I looked it up on Wiki and found various things to do to obtain hearts, and I've either done all of them or the event doesn't exist. There's also a map showing hearts, and the one I need is in this hut-like thing by Frunsenfell Creek.
The picture is here (make it bigger to see it):
And the different text info is here:
I'm at the place and there is no heart option at all, nor is there any other option anywhere else. But it says I have 15/16 hearts, yet I did just get an achievement award and mail from an NPC with a heart icon. So is it bugged? Any help would be appreciated!