material-components-android [Navigation Bar] BottomNavigationView casts a shadow

Description: Do we have to use the BottomNavigationView with the LinearLayout? https://m3.material.io/components/navigation-bar/implementation https://github.com/material-components/material-components-android/issues/2953#issuecomment-1249034716 The BottomNavigationView with the LinearLayout casts no shadow:

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom">
        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:id="@+id/bottomNavigationView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:menu="@menu/main" />
    </LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Screenshot_20220922_130226 The BottomNavigationView without the LinearLayout casts a pale shadow:

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavigationView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        app:menu="@menu/main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Screenshot_20220922_130204