RadioMenuFlyoutItem does not de-select when IsChecked is explicitly set to True

[kazo0]

Current behavior

Given the following XAML

<Button Content="Options">
	<Button.Flyout>
		<MenuFlyout>

			<RadioMenuFlyoutItem Text="Landscape"
								 GroupName="OrientationGroup"
								 IsChecked="True" />

			<RadioMenuFlyoutItem Text="Portrait"
								 GroupName="OrientationGroup" />

			<MenuFlyoutSeparator />

			<RadioMenuFlyoutItem Text="Small"
								 GroupName="SizeGroup" />

			<RadioMenuFlyoutItem Text="Medium"
								 IsChecked="True"
								 GroupName="SizeGroup" />

			<RadioMenuFlyoutItem Text="Large"
								 GroupName="SizeGroup" />
		</MenuFlyout>
	</Button.Flyout>
</Button>

I properly see this upon opening the Flyout:

But, if I were to select a different item with the same GroupName, it properly selects the newly clicked item but it does not deselect the item that originally had IsChecked="True" set in the XAML

Upon Clicking Small:

On Uno Platforms:

On Windows:

Repro app: UnoApp125.zip

Expected behavior

Upon clicking Small, we should only see the Small item as being checked and the Medium item should no longer be checked