ContentTemplate doesn't apply to Button

Describe the bug

I've implement style for Button that wrap the content with ViewBox with overriding ContentTemplate property
But the ContentTemplate doesn't apply to Button's content
` <Style TargetType="Button" BasedOn="{StaticResource DefaultButtonStyle}">

            <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
            <Setter Property="VerticalContentAlignment" Value="Stretch"></Setter>
            <Setter Property="Padding" Value="5"></Setter>
            <Setter Property="Height" Value="45"></Setter>
            <Setter Property="Width" Value="45"></Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"></Setter>
            <Setter Property="ContentTemplate">
                <Setter.Value>
                    <DataTemplate>
                        <Viewbox StretchDirection="Both" Stretch="Uniform" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
                            <ContentPresenter  
                                              VerticalAlignment="Stretch" HorizontalAlignment="Stretch">

                            </ContentPresenter>
                        </Viewbox>
                    </DataTemplate>
                </Setter.Value>
            </Setter>

</Style>`

To Reproduce

Override the "DefaultButtonStyle" style and set ContentTemplate

Expected behavior

The ContentTemplate must be applied to content

Screenshots

No response

OS version

Windows 10 x64

.NET version

.Net 7

WPF-UI NuGet version

3.0.0-preview.2

Additional context

No response

Start by reproducing the XAML example with Button, DefaultButtonStyle, and ContentTemplate in a WPF UI application using WPF-UI 3.0.0-preview.2 on Windows. Trace the Button content presentation behavior and verify that the ViewBox template is applied to the content; the issue names no source file or test, so add focused coverage where the behavior is implemented.