BoxShadow on Border Appears Broken

Describe the bug

BoxShadow on Border Appears Broken

To Reproduce

From ColorPreviewer.xaml in Fluent theme.

            <Border Grid.Column="1"
                    HorizontalAlignment="Stretch"
                    VerticalAlignment="Stretch"
                    BoxShadow="0 0 10 2 #BF000000"
                    CornerRadius="{TemplateBinding CornerRadius}"
                    Margin="10">
              <Panel>
                <Border Background="{StaticResource ColorControlCheckeredBackgroundBrush}"
                        CornerRadius="{TemplateBinding CornerRadius}" />
                <Border CornerRadius="{TemplateBinding CornerRadius}"
                        Background="{TemplateBinding HsvColor, Converter={StaticResource ToBrushConverter}}"
                        HorizontalAlignment="Stretch"
                        VerticalAlignment="Stretch" />
              </Panel>
            </Border>

Expected behavior A clear and concise description of what you expected to happen.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Windows, Mac, Linux (State distribution)]
• Version 92562b0d9979becc8d8c2316e1c2f0678bdae19d

Additional context Add any other context about the problem here.

[robloo]

@timunie I don’t disagree, someone had to make the call. It might be worth it to list as a breaking change though.

[kekekeks]

It’s a bug, not a behavior change