Pop up page not closing when click device back button

I am using Rg.Plugins.Popup NuGet package for showing pop up page. When clicking the android device back button the pop-up page is not hiding, it only closes the content pages. I am working on a .Net standard project.

Versions:

Rg.Plugins.Popup - 1.1.5.180

Xamarin Forms - 3.3.0.967583

Pop-up Page Codes

protected override bool OnBackButtonPressed()
{
    return base.OnBackButtonPressed();
}

protected override bool OnBackgroundClicked()
{
    return base.OnBackgroundClicked();
}

BackgroundClicked closing the pop-up page, but the device back button pressed not closing the pop-up page.