With multi-group membership, a bot's meta carries groups[]; the create dialog's taken-name scan must union all of them (botGroups) or a name only present as a secondary membership could be reused and resurrect that room.
With multi-group membership, a bot's meta carries groups[]; the create dialog's taken-name scan must union all of them (botGroups) or a name only present as a secondary membership could be reused and resurrect that room.