Updated to Ventura and my external Thunderbolt connected backup drive is invisible

After the Ventura update from Monterey, I cannot access my external backup drive. It is an SSD connected via Thunderbolt to my Mac Studio. The drive shows up in Disk Utility, but does not appear on the Desktop or anywhere I can see to access it.

I connected a different SSD drive containing an APSF Volume and a separate Time Machine volume, and the Time Machine volume appears on the Desktop but not the normal data volume.

So apparently Ventura made my backup volumes invisible.

Can anyone help?