Custom Renderer, surface not destructed nor disposed

I have a custom view renderer for android that works with a SurfaceView.

When directly poping to root from the page that uses the custom renderer, the dispose or surface destroyed methods get called.
As soon as i add another page in the stack on top of the page-using-custom-viewrenderer, and PopToRoot from there, the dispose/surface destroyed methods do NOT get called.

Summarized: The SurfaceDestroyed method does not get called as soon as another page is placed on top of it, which makes it impossible to release the camera.

Is this intended? Or a bug? How could i work around that? Right now its not possible to properly releasing the android camera.

Using: Xamarin.Forms 1.3.5-pre1 and Xamarin.Android.Support.v4 21.0.3.0

Here is some dumbed down sample code which enables to check, via console, if the methods are called.

[assembly: ExportRenderer(typeof(ScannerView), typeof(RebuyApp.Android.Renderers.ScannerViewRenderer))]

namespace RebuyApp.Android.Renderers
{
    public class ScannerViewRenderer : ViewRenderer<ScannerView, SurfaceView>, ISurfaceHolderCallback, Camera.IPreviewCallback 
    {
        public void SurfaceDestroyed(ISurfaceHolder holder)
        {
            Log.Debug("ScannerViewRenderer", "SurfaceDestroyed");
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                Log.Debug("ScannerViewRenderer", "Dispose");
            }

            base.Dispose(disposing);
        }

        public void SurfaceChanged(ISurfaceHolder holder, global::Android.Graphics.Format format, int width, int height)
        {
            Log.Debug("ScannerViewRenderer", "SurfaceChanged");
        }

        public void SurfaceCreated(ISurfaceHolder holder)
        {
            Log.Debug("ScannerViewRenderer", "SurfaceCreated");
        }

        public void OnPreviewFrame(byte[] bytes, Camera camera)
        {
            Log.Debug("ScannerViewRenderer", "Dispose");
        }

        protected override void OnElementChanged(ElementChangedEventArgs<ScannerView> e)
        {
            Log.Debug("ScannerViewRenderer", "OnElementChanged");
            base.OnElementChanged(e);


            if (Control == null) {
                Log.Debug("ScannerViewRenderer", "Control == null");
                var surfaceView = new SurfaceView(Context);
                surfaceView.Holder.AddCallback(this);
                SetNativeControl(surfaceView);
            }

        }

    }
}