Android 12 update

Hi

I can no longer view zwift on my TV.

Before update to 12. Hdmi to usb cable. Via dex.

Used this set up for years. Now zwift is not showing on tv. Phone message says connected to external screen. Phone shows dex tracking pad.

I’ve tried different cables. No change.

Oddly does work on a newer TV. Same hdmi to usb cable.

Any ideas?