"Find a missing key" won't disappear from on-screen quest log

I have it, too, for the first time after multiple play-throughs. Really annoying. It only happens if you don't go into the vault for the elven locket. I did not want to waste halla statues on that room as that was not the path I wanted to follow. Other doors needed opening! Almost year and no one has addressed it? FIX IT PLEASE!!! I have at least 2 more play-throughs ahead of me.