Describe the bug

When setting the Version parameter of the XamlControlsResources object to "latest", it is no longer possible to modify the ContentDialog style

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Create a new winui 2.6 app and change the version to "latest"
2. Add a ContentDialog to the project
3. Try to modify its padding by changing it in the resources section:

<ContentDialog.Resources>
   <Thickness x:Key="ContentDialogPadding">0</Thickness>
</ContentDialog.Resources>

4. Observe that the padding does not change

Expected behavior

Padding should change

Screenshots

Version Info

NuGet package version:

[Microsoft.UI.Xaml.2.6.0-prerelease.210217002]

Windows app type:

Additional context