For the quest "Explore the Crumbling Ruins" in Lowerdark, nobody in the party could figure out how to get pass the eastern-most door from the starting corridor. No key dropped anywhere in the quest, and although we could damage the door with elemental damage weapons, it wouldn't actually break. There was no getting by it.
I'm unsure if it's relevant, but the quest didn't actually appear in our quest log even though we had it.
Yes, i've done this twice now, and i was waiting to see if 1: resets would effect it or 2: it would remain unlocked. As it is now, As said, you cannot ( without dm assistance) get to the final area. I'd suggest adding a key to the Sub-boss, so that while you can't cheese the quest, you can complete it.
And as Savant said, The journal only desplays an error message, which does not update, though you can close the quest /after/ you kill the final boss.
Issue with the key not dropping from the subboss should now be fixed.