Previous fragment not loaded when pressing Back button using BottomNavigationView

I have an activity_main.xml with an BottomNavigationView and a NavHostFragment.

There are 2 tabs, HomeFragment with a video and FavoritesFragment. Within FavoritesFragment there is a list of favorite video's (thumbnails) and when I click on an item it loads the HomeFragment view with that specific video.

within mobile_navigation.xml I have defined the HomeFragment twice. 1 is the Home Tab and 1 is the "Favorite" when clicked on the thumbnail in FavoritesFragment.

When I click the back button I expect to be back in the FavoriteFragment. But the App shuts down.

When the thumbnail is clicked, this code is executed:

            val action = FavoritesFragmentDirections
                .actionNavigationFavoritesToNavigationFavorite(imageUri)
            NavHostFragment.findNavController(this@FavoritesFragment)
                .navigate(action)

I also tried this:

protected fun showFragment(fragment: Fragment, uniqueName: String) {
    activity?.supportFragmentManager
        ?.beginTransaction()
        ?.replace(R.id.container, fragment)
        ?.addToBackStack(uniqueName)
        ?.commitAllowingStateLoss()
}

But same result.

With this:

override fun onBackPressed() {
    super.onBackPressed()

    if (!navController.popBackStack()) {
        // Call finish() on your Activity
        finish()
    }
}

The back button goes back to the HomeFragment, instead of FavoritesFragment.

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mobile_navigation"
    app:startDestination="@+id/navigation_home">

    <fragment
        android:id="@+id/navigation_home"
        android:name="eu.theappfactory.dailyrecipes.ui.home.HomeFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home">

        <argument
            android:name="imageuri"
            app:argType="string" />
    </fragment>

    <fragment
        android:id="@+id/navigation_favorites"
        android:name="eu.theappfactory.dailyrecipes.ui.favorites.FavoritesFragment"
        android:label="@string/title_account"
        tools:layout="@layout/fragment_favorites" >
        <action
            android:id="@+id/action_navigation_favorites_to_navigation_favorite"
            app:destination="@id/navigation_favorite" />
    </fragment>

    <fragment
        android:id="@+id/navigation_favorite"
        android:name="eu.theappfactory.dailyrecipes.ui.home.HomeFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home">

        <argument
            android:name="imageuri"
            app:argType="string" />
    </fragment>
</navigation>

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