During initialization of the phase time records the code uses the wrong enum to register the "Skipped Cards" to the "Update RS" logging structure.

I.e.
      _gc_par_phases[UpdateRS]->link_thread_work_items(_update_rs_skipped_cards, ScanRSSkippedCards);

which should be

    _gc_par_phases[UpdateRS]->link_thread_work_items(_update_rs_skipped_cards, UpdateRSSkippedCards);

Since the value of ScanRSSkippedCards equals UpdateRSSkippedCards there is no harm.