Appshell NavBar and TabBar not work fine in Android(Using Xamarin.forms)

Question

I want set Appshell NavBar and TabBar Invisible when Device is Horizontal and visible when Vertical.

I code like following , it works fine in IOS, but when Android device changed to Horizontal, the object on NavBar and TabBar is disappeared and both of bar is still there and TabBar become black.

I think the page refresh event is quick than OnSizeAllocated, but I don't know how to refresh page again after by code.

Please help me!

        protected override void OnSizeAllocated(double width, double height)
        {
            //When device is rotated to Horizontal, change legend orientation
            if (this.Width > this.Height)
            {  //Horizontal
                AppShell.SetNavBarIsVisible(this, false);
                AppShell.SetTabBarIsVisible(this, false);
            }
            else
            {  //Vertical
                AppShell.SetNavBarIsVisible(this, true);
                AppShell.SetTabBarIsVisible(this, true);
            }
            base.OnSizeAllocated(width, height);
        }