Setting Background on GridSplitter breaks Style

[hoiton]

Describe the bug

Setting the Background Property on the GridSplitter breaks the Style when hovering over the GridSplitter. The Colour of the Splitter seems to flicker:

The problem appears both in dark and light Themes:

Steps to reproduce

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="10" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Button>Click Me</Button>
    <controls:GridSplitter Background="#f0f0f0" Grid.Column="1" />
    <Button Grid.Column="2">Click Me 2</Button>
</Grid>

Expected behavior

I expect the GridSplitter to support a custom Background without flickering

Screenshots

No response

Code Platform

• [ ] UWP
• [X] 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)
• [X] Other (specify)

Other Windows Build number

Windows 11 23H2 (Build 22631)

App minimum and target SDK version

• [X] 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

17.9.1

Device form factor

Desktop

Additional context

No response

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