Geirmund's Hall has an entrance you can't get back to, and the exit door sometimes doesn't open properly. Here's a workaround.
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Permissions don't apply in this case. It's a vanilla asset. I duplicated a vanilla asset.
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So I was doing Forbidden Legend the other day. You know, get the Gaulder amulet, kill the three bosses, reforge it. Got to Geirmund's Hall, dropped into the dungeon, killed the boss, and...the door didn't open. The door is supposed to open when you kill the boss.
Next step obviously: check UESP. And in the bug reports, lo and behold, it's a known issue that sometimes the door simply fails to trigger properly. So I added a pull chain connected to the door. Now I can't get stuck there anymore, and neither can you.