Black screen only on MacOS login

When a user is logged into the affected MacOS device (Intel iMac Pro on Sonoma), RealVNC works as expected, but when a user logs out, RealVNC only shows a black screen with a mouse cursor. Sometimes, on a fresh reboot, I might be able to see and control the login screen, but this consistently stops working once a user logs in and out.

This is on a fresh install of Sonoma, with screen record and accessibility permissions allowed for vncagent and RealVNC Server applications, and Filevault is not enabled for this device.

I have also tested a similar device - an M1 MacBook Pro - using the same settings, and this test device does not experience the same issue, I am able to see and control the screen regardless of if a user is logged in or not.

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