full disk access and/or accessibility tables in settings blank

On both an intel-based imac and an M1 MacBook Pro I am periodically losing all entries in the full disk access and/or accessibility tables in the settings app.

I am then unable to add apps to the relevant table(s).

This I have been seeing since upgrading to Ventura. I am currently at 13.1.

This makes my Macs virtually unusable.

When this last happened I had to rebuild my M1 Mac by starting with a brand new installation followed by a migration (even a normal recovery did not work).

Help please.

Bill