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When a new bridge is created, an undo command is created for that. When undo the action and redo it, all terminals are bridged to a new bridge instead of the first one, who continue to exist but is now empty and 'lost' because he will never be reused. In addition of that, if a more recent undo command (we call it undo2) use this bridge, there is a unknown behavior, because the status of the bridge is not the same as when the undo2 was created.