Does anyone know of any reason

BackHandler

might not be intercepting back press? I am using it in a fragment:

@AndroidEntryPoint
class MyFragment : BaseFragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return ComposeView(requireContext()).apply {
            setContent {

            BackHandler {
                    // not called when back press
                   someAction()
            }
        }

This is one situation where BackHandler is not invoked. Not sure if it applies to your situation: https://issuetracker.google.com/issues/201909853

Unfortunately no, i am not using a DialogFragment, thank you