[iOS/Mac] ImageButton does not render its background when CornerRadius is larger than half of its size #39485

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="ImageButtonCornerRadiusRepro.MainPage">

    <VerticalStackLayout Padding="20" Spacing="20">

        <!-- 1. Visible: red square -->
        <ImageButton BackgroundColor="Red"
                     WidthRequest="50" HeightRequest="50"
                     HorizontalOptions="Start"/>

        <!-- 2. Visible: red circle (radius = half of size) -->
        <ImageButton BackgroundColor="Red" CornerRadius="25"
                     WidthRequest="50" HeightRequest="50"
                     HorizontalOptions="Start"/>

        <!-- 3. BUG: completely invisible (radius > half of size) -->
        <ImageButton BackgroundColor="Red" CornerRadius="100"
                     WidthRequest="50" HeightRequest="50"
                     HorizontalOptions="Start"
                    Clicked="ImageButton_Clicked"/>/>

    </VerticalStackLayout>
</ContentPage>

private void ImageButton_Clicked(object sender, EventArgs e)
	{
		DisplayAlert("ImageButton Clicked", "You clicked the image button!", "OK");
	}