BrogueCE
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Key trap leaves no navigable path to vault door
Taking the key makes a chasm which removes the only navigable path. It's still possible to reach the vault door, but only by crossing deep water.
Another likely example from RapidBrogue described here: https://www.reddit.com/r/brogueforum/comments/v4lvo8/bug_in_301635075_in_rapidbrogue/