Oh thanks for the quick reply. I did go into other dungeons and collect a master key from those dungeons, I wouldn't be surprised if that's what caused the issue I got!
Hello! I did have something weird like that happen, now that you mention it. I was in another dungeon, and I noticed that I had a master key already and was able to sequence break the dungeon that way, and the master key in there couldn't be picked up. I didn't think about taking that master key specifically and using it back on the other dungeon I got stuck on. That might let me continue on. Thank you!