As the title says, the quest Corruption in Maraudon is not giving the option to turn in the quest. When the last boss dies, the quest completes, but does not give the turn in popup.
Top comment mentions it, and most recent comment mentions how its bugged.
https://www.youtube.com/watch?v=upZ01nsW9KU&t=4m
At 4 minutes in this video from original cata, you can see the missing “Click to complete quest” popup.