findNavController().getBackStackEntry(R.id.gamesFragment).savedStateHandle.set("myData", "Test")

BottomSheetSampleFragment.kt

class BottomSheetSampleFragment : BaseBottomSheetFragment() {

    private var _binding: FragmentBottomSheetSampleBinding? = null
    private val binding get() = _binding!!

    val timerTotal = 600000L // 10 Min
    lateinit var timer: CountDownTimer

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val dialog = super.onCreateDialog(savedInstanceState) as BottomSheetDialog
        dialog.setOnShowListener {
            val bottomSheet =
                (it as BottomSheetDialog).findViewById<View>(com.google.android.material.R.id.design_bottom_sheet) as FrameLayout?
            val behavior = BottomSheetBehavior.from(bottomSheet!!)
            behavior.state = BottomSheetBehavior.STATE_EXPANDED
            behavior.isDraggable = false
        }

        return dialog
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        _binding = FragmentBottomSheetSampleBinding.inflate(inflater, container, false)
        return binding.root
    }

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

        timer = object : CountDownTimer(timerTotal, 1000) {
            override fun onFinish() {
            }

            override fun onTick(millisUntilFinished: Long) {
                binding.textViewCounter.text =
                    TimerFormatter(
                        millisUntilFinished
                    ).getRemainingTimeText()
            }
        }.start()

        binding.buttonAddAnotherFragment.setOnClickListener {
            findNavController().navigate(R.id.action_bottomSheetSampleFragment_self)
        }


        findNavController().getBackStackEntry(R.id.gamesFragment).savedStateHandle.set("myData", "Test")
    }

    override fun onDestroyView() {
        super.onDestroyView()
        timer.cancel()
        _binding = null
    }
}

GamesFragment.kt

class GamesFragment : BaseBottomTabFragment() {

    private var _binding: FragmentGamesBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        _binding = FragmentGamesBinding.inflate(inflater, container, false)
        return binding.root
    }

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

        binding.buttonReplaceFragment.setOnClickListener {
            navigateWithAction(
                GamesFragmentDirections.actionGamesFragmentToDynamicTitleFragment(
                    "Replace"
                )
            )
        }

        val navController = findNavController();
        val navBackStackEntry = navController.currentBackStackEntry!!
        navBackStackEntry.lifecycle.addObserver(LifecycleEventObserver { _, event ->
            if (event == Lifecycle.Event.ON_RESUME
                && navBackStackEntry.savedStateHandle.contains("myData")) {
                val result = navBackStackEntry.savedStateHandle.get<String>("myData");
                Toast.makeText(requireContext(), result, Toast.LENGTH_SHORT).show()
            }
        })
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }
}

nav_graph.xml

<fragment
        android:id="@+id/dynamicTitleFragment"
        android:name="com.faskn.trickynavigationsample.fragments.DynamicTitleFragment"
        android:label="{title}"
        tools:layout="@layout/fragment_dynamic_title" >
        <argument
            android:name="title"
            app:argType="string"
            android:defaultValue="Title" />
        <action
            android:id="@+id/action_dynamicTitleFragment_to_bottomSheetSampleFragment"
            app:destination="@id/bottomSheetSampleFragment"
            app:popUpTo="@id/gamesFragment"/>
    </fragment>