onOptionsItemSelected is not called for `android.R.id.home`

Question

I looked trough all already existing threads, but I was unable to figure out why my onOptionsItemSelected method in Fragment is not called for Up/Home button click in App Toolbar (android.R.id.home).

class SomeFragment : Fragment() {

    override fun onCreateView(//...): View {
        //...
    }

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

    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
        super.onCreateOptionsMenu(menu, inflater)
        menu.add(Menu.NONE, 1, Menu.NONE, "Test").setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM)
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            1 -> {
                // This does get called normally for right placed "Test" button
            }
            else -> {
                // Nothing gets called here when I click left placed back button
            }
        }
        return true
    }
}

I have setDisplayHomeAsUpEnabled(true) in my BaseActivityHandler and back button works, I am just unable to catch it in fragment (I need to show alert "Are you sure?")

EDIT: I found out that in Activity, onOptionsItemSelected is handling android.R.id.home and I am doing navController.navigateUp() in there. How to make Fragment's onOptionsItemSelected called first, so I can first of all show the alert and then do navController.navigateUp()?