RadioButtonGroup not working with CollectionView

[michele-guion]

Description

I have a StackLayout which contains a CollectionView made of radio buttons.
RadioButtonGroup.SelectedValue is correctly bound in .NET9, but not in .NET10.

Steps to Reproduce

<StackLayout RadioButtonGroup.GroupName="{Binding GroupName}" RadioButtonGroup.SelectedValue="{Binding SelectedValue}" >
    <CollectionView
        SelectionMode="None"
        ItemsSource="{Binding Items}">
        <CollectionView.ItemTemplate>
            <DataTemplate x:DataType="x:String">
                <RadioButton 
                    Value="{Binding .}"
                    Content="{Binding .}"
                    GroupName="{Binding GroupName, Source={RelativeSource Mode=FindAncestorBindingContext, AncestorType={x:Type models:MainPageModel}}, x:DataType=models:MainPageModel}" />
            </DataTemplate>
        </CollectionView.ItemTemplate>
    </CollectionView>

    <Label Text="Group name:" />
    <Label Text="{Binding GroupName}" />

    <Label Text="Selected value:" />
    <Label Text="{Binding SelectedValue}" />
</StackLayout>

In .NET9, if you change the selection, the label will be updated accordingly. In .NET10 this does not happen.

Link to public reproduction project repository

No response

Version with bug

10.0.20

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

9.0.120 SR12

Affected platforms

I was not able test on other platforms

Affected platform versions

No response

Did you find any workaround?

I manually managed CheckedChanged event on the radio buttons and update the model accordingly.

Relevant log output

[NafeelaNazhir]

This issue has been validated in Visual Studio Code 1.107.1 with MAUI versions (10.0.20, 10.0.10, 10.0.0 ,10.0.0-rc.2, Preview7, Preview4, Preview5 and Preview1). It was reproducible with Maui versions(10.0.0-preview.5, Preview7, 10.0.0-rc.2, 10.0.0, 10.0.10, 10.0.20) in Android, iOS , Catalyst and Windows platform. It was not reproducible below 10.0.0-preview5.

RadioButtonTriage 2.zip