Got it, and I also found the delivery side quest... but then when I went to the next boss it turns out it was a platforming challenge. Fuck that, quit before even trying to figure out how the mechanics work.
And I can't use Google search to backtrack from that dungeon either... so the last useful save I have is one right before I fought the DLC final boss. I guess I'll beat it again, do the delivery quest again, get the last plush again, but not go into Alwaysland 2, and then, uh, do the Sky Abyss again, I guess...