Yes, the main camera and selfie camera work on my SM-T825,
but - ‘Scan QR code’ does not work either via F-Droid Store > Add new repository. Same problem with ‘Secure camera’ (GrapheneOS).
So the QR code could not be identified by IzzyOnDroid repo. Lawnchair 14 beta 3 promises more than it gets. I still prefer the oldies OpenLauncher or Simple Launcher