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'Specified cast is not valid' exception when adding Forms.Image with AddCustomView on Android

The following code:

Xamarin.Forms.Image mapMakerImage = new Xamarin.Forms.Image();


mapMakerImage.Source = "placeholder.png"; 
mapMakerImage.WidthRequest = ...;
mapMakerImage.HeightRequest = ...;


customViewSettings.Bounds = new Rectangle(...); 
editor.AddCustomView(mapMakerImage, customViewSettings);


causes 'S

pecified cast is not valid' exception to appear. (Don't have the full stack but the last point is at FormsConverToNative-something).


The issue appears on Android only. iOS is fine.

Forms: 4.2.0.709249

Android: 9.0 (Pie)