18 Hours ago, and still bugged. Thx Blizzard.
Is it really bugged? I just checked my map and could see the quest mark at the heart of the forest, so I just flew over and Ysera standing in her usual spot and I was able to finish the Quest. I didn´t had to relog or else. In the grove i didn´t get any choices to finsih the quest, at the heart I could. I am a nightfae player, so other covenants have to talk to a NPC to get her out. Try that.