Issue #27724: Silver Shroud Quest: Kent Connolly is stuck in Medford Hospital
Location: Medford Hospital, Final stages of the Silver Shroud quest.
If the player manage to save Kent, he will be stuck in the hospital basement. Ken has a path (which is partially broken) to come back in his room, in Good Neighbor.
Often the players will not realize that Kent is still stuck here and so on will be unable to complete the costume upgrade misc quest.
Someone even made a video about it: