On Heorot’s Sanctum (first quest in Reign of Dragon timeline), you have to kill the “injured dragon”. If you kill the dragon too fast, the quest gets stuck. This is easily reproduced on Acolyte with transplant + 15% culling effect. As soon as the dragon appears on the edge of your screen transplant and instantly kill the dragon and the mission will bug:
Poor dragon, fought his hardest, just to get one tapped by some creppy lady 
This is a known issue, we are investigating a solution
Having the same issue. Just instakilled him by lunge with kill threshold. Funny it happened twice in a row because the first time I thought it was just because I was lagging that much, whole game was a mess for me that game. Just the second time I lunged at him I realized what happened.
If the objective updates after he is already dead it won’t ever count his kill, the game doesn’t look if it already happened.
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