I got stuck with a pair of crappy bard pants almost the same way last night. (Basically, my mistake was not bailing on the instance within 10 seconds of killing Acheron.)
Try casting lot's/passing before skipping the cutscene. If you bring up the chat prompt during the CS you'll be able to see the loot notice, etc.

But yeah, people exiting immediately is bloody annoying, it's not that hard to wait an extra 15 seconds for the loot to fall. Having said that, it's allowed by the game mechanics and probably needs addressing by SE so the potential of this happening is removed from CT.