At first, I didn’t think the barrel did anything. Then, I Googled the issue, and learned that it gives me an item. I checked my inventory and my bank, and the item was in neither. Could I have destroyed the item without realizing what it is? If this is the case, would I be able to acquire another one somehow? For the sake of map completion, I’d love to find a solution to this problem. Thank you.
EDIT: Nevermind. I went back after I’ve done everything else on the map, and it worked. Not sure what the problem was.