[AppBarButton][Material] DataContext is not propagated to AppBarButton's Content when using the MaterialAppBarButton style

[kazo0]

Current behavior

On iOS and Android, having a a ViewModel as the DataContext of the current Page and the following XAML results in a blank AppBarButton. The DataContext is not passed along to the Content. Removing the Ripple control from the template of the MaterialAppBarButton style results in the TextBlock displaying the proper value.

<AppBarButton Style="{StaticResource MaterialAppBarButton}">
    <TextBlock Foreground="Black"
                Text="{Binding ViewModelName}" />
</AppBarButton>

Expected behavior

TextBlock should have the proper DataContext and should display as the Content of the AppBarButton