I have a button in my app which calls Rho::NFCManager.enable
On clicking that button, the app built with Rho 7.5 exits when its run on an Android 12 device. However the same app runs fine in an old Android 6.0.1 (Cyanogen) device. Ditto on a more recent Android 11 device. Then I take that very same app and built it with Rho 7.2.2 and deploy again in Android 12 device. Now it runs fine.
So I conclude that there might be a bug in NFCManager in Rho 7.5. I could be wrong, though. Would be grateful if it could be investigated.