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Passing null as the image parameter is how you clear the image, but this isn't allowed by the binding.
Null has been allowed for UIButton.SetBackgroundImage since 5.4 - do you have a test case where this happens for you?
Sorry, I got the type wrong. I was working with UIStepper, not UIButton. It should allow null background images.
(I got confused because their appearance data is semi-shared due to composition.)