windowbackground not work in dark and light theme

I have a theme that user can choose light or dark, everything work fine but, there are 2 problems:

1. When I open the app [in dark/light theme ], a white page is displayed first, then the application uses a dark theme
2. When I change the theme, a black screen appears first

I tried to change the background but did not work, I changed the color of it and also I used drawable shape. Anyway, it not work and use one color for both.

style.xml

 <style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar"/>

values/themes.xml

<style name="Theme.MaterialComponents.DayNight.NoActionBar"
        parent="Theme.MaterialComponents.Light.NoActionBar">

    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowBackground">@drawable/window_background</item>
</style>

values-night/themes.xml

<style name="Theme.MaterialComponents.DayNight.NoActionBar"
        parent="Theme.MaterialComponents.NoActionBar">

    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/TabBackground</item>
    <item name="colorAccent">@color/green_inactive</item>
    <item name="android:windowBackground">@drawable/window_background_dark</item>

</style>

windows_background

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <solid android:color="#64b5f6"/>
</shape>

windows_background_dark

Similar to the above code, only the color is different

and this is how I load theme

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (Prefs.getIsDarkMode(getApplicationContext()))
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
    else
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

    setContentView(R.layout.activity_main);
}