SettingsExpander - Border not showing

[DFX-Coding]

Describe the bug

If you set a border on the SettingsExpander with the 'Border' property, it will not be displayed.

<control:SettingsExpander
    BorderBrush="Red"
    BorderThickness="5"
    Description="Test Description"
    Header="Test Header">
    <control:SettingsExpander.Items>
        <control:SettingsCard />
    </control:SettingsExpander.Items>
</control:SettingsExpander>

Steps to reproduce

Create a new WinUI 3 project and paste the XAML sample from above as the content of the page.

Expected behavior

A red border around the SettingsExpander should be displayed.

Screenshots

No response

Code Platform

• UWP
• WinAppSDK / WinUI 3
• Web Assembly (WASM)
• Android
• iOS
• MacOS
• Linux / GTK

Windows Build Number

• Windows 10 1809 (Build 17763)
• Windows 10 1903 (Build 18362)
• Windows 10 1909 (Build 18363)
• Windows 10 2004 (Build 19041)
• Windows 10 20H2 (Build 19042)
• Windows 10 21H1 (Build 19043)
• Windows 10 21H2 (Build 19044)
• Windows 10 22H2 (Build 19045)
• Windows 11 21H2 (Build 22000)
• Other (specify)

Other Windows Build number

Windows 11 23H2 (Build 22631)

App minimum and target SDK version

• Windows 10, version 1809 (Build 17763)
• Windows 10, version 1903 (Build 18362)
• Windows 10, version 1909 (Build 18363)
• Windows 10, version 2004 (Build 19041)
• Windows 10, version 2104 (Build 20348)
• Windows 11, version 22H2 (Build 22000)
• Other (specify)

Other SDK version

No response

Visual Studio Version

2022

Visual Studio Build Number

Version 17.9.2

Device form factor

Desktop

Additional context

No response

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