This read-create TruthValue controls whether the Facility Protection Group automatically reverts to the working facility once a fault clears; it does not apply when cmFacProtGroupSwitchMode is dualactiverx. It determines whether service automatically returns to the primary port after it recovers, or stays on the protect port until an operator intervenes. For example, a non-revertive group left on the protect port after a fiber cut is repaired will stay there until someone issues a manual switch, which matters for anyone assuming traffic is back on the original path.