No luck here. I’ve been tracking a similar issue for a few months, most recently here:
https://community.roonlabs.com/t/google-hub-wont-keep-now-playing-screen-wont-stop-displaying/
I am able to enable screen reading and see the red box (and Google Hub is reading my display screen), but it’s still displaying the generic “Playing Roon” screen when I stream content to the device.