Found that Software Update Policy created for the following Bulletins have Software Update Advertisements being disabled when the PMImport is executed with the 'Disable all superseded Software Updates' setting is enabled:
Confirmed that Microsoft does list that some of the updates were Superseded; however, there are multiple instances where the update was not listed as Superseded, yet it still gets disabled when the above named process runs on schedule.
Inaccurately set the 'Superseded' status on several Software Updates.
This issue was resolved in PMImport v7.1.802 released on 4/29/16.