While I had the “Keep Key” quest item, I accidentally teleported “off” the map (some pathable place underneath a bridge tile). I couldn’t teleport or “dodge-teleport” back to the proper map layer, so I had to use the “Leave Dungeon” option. As a result, the key dropped on the floor as I left. This meant that when I returned to finish the dungeon the key was still stuck under the floor:
Images available here: imgur[dot]com/a/uCFTp8f
Broken Bulwark is broken. This happened to me too: imgur[dot]com/i8gbAcN.
Unfortunately I had to exit the game to restart the dungeon and do it again 
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