Field "HandleKeyboardOnFocus" always null

Hey guys,

I have an app where you can scan barcodes.
If a view is loading, I set the focus programmatically on the searchbar ( MySearchBar.Focus() ).
With the following code I prevent the keyboard to popup:

    class HideSearchBarKeyboard : SearchBarRenderer {
        public HideSearchBarKeyboard(Context context) : base(context) {
        }
        protected override void OnElementChanged(ElementChangedEventArgs<SearchBar> e) {
            base.OnElementChanged(e);
            if (e.OldElement == null) {
                var field = this.GetType().GetField("HandleKeyboardOnFocus", BindingFlags.Instance | BindingFlags.NonPublic);
                field.SetValue(this, false);
            }
        }
    }

Today I upgraded Xamarin.Forms to version 3.6 and after that the "field" property is always null.

I checked the github page and found some requests like the pull request "4248" (can't post links, sorry)

But I have absolutely no clue, how I can now hide the keyboard when I focus the searchbar.

So the previews behavior was:

• Open some view = keyboard hidden
• MySearchBar.Focus() = keyboard hidden
• User clicked on searchbar = keyboard shown

Can someone guide me to the right direction?