Not sure if this is a bug. I killed the fat goblin and got his key and returned to the metal door that had the water sounds. Upon getting into the room, it won't let me enter the next one. There's no door or anything and I hear the water off to the left, but walking into the area doesn't put you into the next room. So you just get soft locked.
Edit: Saw something about this in the newest patch. Wanted to state that I am currently on that patch as well and getting this. I tried to start my save over and it seems that as soon as I open the door, the quest for finding the key immediately turns back into incomplete after already having it complete, making it so you can't progress. However, after a few repeats, it let me go through and I'm not sure what was done different to get it to let me.
Edit: Saw something about this in the newest patch. Wanted to state that I am currently on that patch as well and getting this. I tried to start my save over and it seems that as soon as I open the door, the quest for finding the key immediately turns back into incomplete after already having it complete, making it so you can't progress. However, after a few repeats, it let me go through and I'm not sure what was done different to get it to let me.

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