Android 16 - Fermata only allows app casting

[xairr1]

I'm using a Samsung Galaxy S25 running One UI 8.0 (Android 16)
Fermata version 1.9.9 installed using Kinginstaller (using arm64 for my device)
Adb applied as per #589
Using AAwireless TWO+ in Dev mode
Accessibility settings are correct

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When I launch Android Auto, FS mirror (pink) launches and on my phone, I get a prompt asking which app I'd like to cast. However it does not give me the option to cast the whole screen - only ever one application. How do I resolve this please?

EDIT: This was resolved by using WiFI debugging rather than USB debugging for the adb. Perhaps a dodgy cable?