SlidingUpPanel with BottomNavigation Help ....

Hello. Now i found bug SlidingUpPanel with BottomNavigation.

The problem is fragment layout don't show when app started. Change the tab and it will be visible So I have to do this every time you launch the app.

<!-- Notice the attribute layout above -->
<com.sothree.slidinguppanel.SlidingUpPanelLayout
    android:id="@+id/main_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/nav_view"
    android:background="@color/teal_200"
    android:gravity="bottom"
    app:umanoPanelHeight="70dp"
    app:umanoShadowHeight="5dp"
    tools:context=".MainActivity">

    <!-- Fragment container here -->
    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/back_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#42A5F5">

        <fragment
            android:id="@+id/nav_host_fragment_activity_main"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:defaultNavHost="true"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:navGraph="@navigation/mobile_navigation" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <!-- Mini Player here -->
    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/slide_layout"
        android:visibility="gone"
        android:background="@color/white"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <FrameLayout
            android:id="@+id/frame_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>


</com.sothree.slidinguppanel.SlidingUpPanelLayout>

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/nav_view"
    android:layout_width="match_parent"
    android:layout_height="?actionBarSize"
    android:layout_alignParentBottom="true"
    android:background="?android:attr/windowBackground"
    app:menu="@menu/bottom_nav_menu" />

Library Guide need root element. But my code root element is RelativeLayout because of Bottom Nav.

If the guide is mandatory, is there a solution?