Owners/Members unable to search for files Post SharePoint Online migration

Hi,

Did you ever find any more information about these Indices? I have recently had issues with the Viva Learning Content Libraries being dropped from the Viva Learning App via SharePoint Content Provider.
Since these columns are not visible in the Library Settings, I am wondering if it is safe to delete them and then add my own Index Columns.

The Viva Learning had been working fine for a couple of years and then suddenly all SP Content disappeared.
All the Content was actually there but the Links that were in the Repository List configured in the Learning Admin Portal stopped working.  The links were valid, but the App would not ingest them. I created another Repository Item that was a link to an existing Library was created and the App ingested it fine.