Bag of Tricks Vol. 78: Make Sure to Exit the Merchant Prince Folly's Skirmish Before Re-Queueing - Neverwinter:Unblogged
Next to the ongoing Ras Nsi loot issues, players have to fend off a similar, yet comparably minor, issue with another Mod 12 reward chest right now. If you're running the Merchant Prince's Folly skirmish a lot, you might have experienced a situation in which you can't interact with the end chest.