To answer Kantok, when you go to load the game, if you hover over the saved games name it will tell you what version it is. I also had a big with this quest, but it isn't the same, so I'll report it in it's own thread so as to not cause confusion. I did get a screen saying I received heart seeker (but then i ran into my own issue before I ever finished the arena), so I'm not getting the same issue (not saying it isn't happening to you, just saying in my case, it didn't happen).
But if you start a game in .90 and then continue it in .91 once you save in .91 it will tell you .91 as your version, regardless of whether or not you actually started the game in .90 or .91. What I was asking was if the SD guys had any way to tell, because I'm pretty certain it was a .91 created game.
I plan on playing a fresh game to look for this but life has gotten in the way the last few days.