.net maui onplatform font size not working for iOS

I'm trying to use OnPlatform XAML option to get appropriate font sizes for different platforms. Code snippet below, values just samples; I've tried many different ones!

Android and UWP respond to whatever I set, but for iOS nothing ever changes. (And just as an aside, I can't change the font color on iOS either, but I'm less worried about that at the moment!)

Any hints anyone?

<RadioButton Style="{StaticResource RBStyle}" Content="Cy" VerticalOptions="Center" >
  <RadioButton.FontSize>
      <OnPlatform x:TypeArguments="x:Double">
          <On Platform="Android" Value="20"/>
          <On Platform="iOS" Value="10"/>
          <On Platform="UWP" Value="30"/>
      </OnPlatform>
  </RadioButton.FontSize>
</RadioButton>

This seems to be a bug in .NET MAUI.

FontAttributes property doesn't work on iOS, too.

Fortunately, iOS supports using a View for the Content property of RadioButton, so you can apply a workaround like this.

MainPage.xaml

<RadioButton Content="Cy" VerticalOptions="Center" x:Name="MyRadioButton">
    <RadioButton.FontSize>
        <OnPlatform x:TypeArguments="x:Double">
            <On Platform="Android" Value="20"/>
            <On Platform="UWP" Value="30"/>
        </OnPlatform>
    </RadioButton.FontSize>
</RadioButton>

MainPage.xaml.cs

public MainPage()
{
    InitializeComponent();
    
#if IOS
    MyRadioButton.Content = new Label
    {
        Text = "Cy",
        FontSize = 10
    };
#endif
}

If you want to track the issue status: https://github.com/dotnet/maui/issues/19081