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Created attachment 25355 [details]
Custom Picker with dummy (empty) renderer shows "0" in the list when ItemsSource is null on Android.
Using Xamarin.Forms 18.104.22.1682.
Reproduction project is attached, alternatively it is available on github: https://github.com/yuv4ik/Xamarin-Forms-Android-Picker-Bug.
Created attachment 25356 [details]
As a workaround Renderer can be replaced by Effect:
This workaround can be applied only in simple cases.