The clock class doesn't return to Locked (6) from a degraded clock class (135, 165, 248).

    ptp-operator.v4.20.0-202508140915

    100%

    1.Cause a loss of upstream clock by taking down the upstream interface connection; ip link set ens2f3 down.
    2.Clock Class downgrades.
    3.Recover upstream interface; ip link set ens2f3 up.     

   Clock Class remains on the last class; e.g. Clock Class degraded to 135, upstream clock connection resumes, Clock Class remains on 135.

    Clock Class returns to locked class; e.g. Clock Class degraded to 135, upstream clock connection resumes, Clock Class turns back to 6.