NextScreenFragment.kt

@AndroidEntryPoint
class NextScreenFragment : Fragment(R.layout.fragment_next_screen) {

    private val navigation: NavController by lazy {
        findNavController()
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        observeViewModel()
    }

    private fun observeViewModel() {
        with(nextScreenViewModel) {
            backRequest.observe(viewLifecycleOwner) {
                navigation.previousBackStackEntry?.savedStateHandle?.set("key",true)
                navigation.popBackStack()
            }
        }
    }
}