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I got the kills for Ice Gnawer and Flamentus shown as completed in my quest log and it tells me to return to Lisandia and she has a quest marker over her head but when I greet her I just get the standard greeting from her and the quest doesn't update.
I think you have to loot something from them and have them in your inventory when you talk to her... at least that's how I remember it. The wiki seems to disagree. I haven't done it in a while though, so I can't test it out until my lvl 85 is a lvl 90.
I've seen people experience this bug for a while...no idea how it comes up, and also no idea why it doesn't affect some (even leveling while reports started to appear, i have never experienced the bug) but it seems to reoccur for most people.
And yeah Rackie, you do need stuff looted! But...the loot is given automatically now (i.e. you don't need to manually loot it) and even with the stuff, the quest is still temperamental abotu it's completion.
I did a full patch and cleared my world cache and then was able to turn the quest in.
Hope that might help others.