When doing this quest, I first did some of it by defending Hautclaire Vale, then ran north and did the heart and lots of events in Hunter’s gorge, came back down to finish the previous one and found that using the scrap pile around where I am standing in the picture would not cause it to disappear, so it can be used over and over to finish the quest with no effort.
EDIT: Thinking it might have been because of my full inventory maybe.
