Monolith Heorot's sanctum lunge bug

I killed the injured dragon in the “heorot’s sanctum” quest echo, with lunge kill threshold and it didn’t validate the obective of the quest.
I had to redo the quest and kill him without using lunge.

Can confirm, had the exact same thing happening. i lunged in from outside the room, before the dragon “activated” and the quest updates.

Same thing except I was able to trigger the same issue with “Shift” instead of Lunge.