@DennisMX If you're looking at System Settings to see what has been granted Full Disk Access be aware that the GUI does not show items that have that access granted via a MDM deployed Configuration Profile (same for the other settings under Privacy & Security)

So it could well be that our security solution still works as expected, i'm running a version that is listed by the supplier as Ventura compatible.

https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/mac-whatsnew?view=o365-worldwide

From Malwarebytes.. 291428-ventura-causes-real-time-protection-to-turn-off

We had this with ESET too - [KB8339] After upgrading to macOS Ventura (13), you received a warning: Your computer is not fully protected (eset.com)

we had a similar concern with Carbon Black but after looking at the logs Full Disk Access was still enabled even though the toggle in system settings was off.

I think MS Defender has the same thing, is seems to work just fine on Ventura.
Is there a way we can confirm fda is still working, apart from running a scan?

(Apart from a different issue introduced all OS'es in the latest version)

Only way I confirmed was running a scan then checking the logs for errors. 

You can check "mdatp health" and confirm it's healthy. 

what an obnoxious bug... at least it's just visually confusing