Modify low DPI, white border appears at the top of the window

[deisier]

Describe the bug

<Window x:Class="mDemo_1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:mDemo_1" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:media="using:Microsoft.UI.Xaml.Media" xmlns:muxc="using:Microsoft.UI.Xaml.Controls" mc:Ignorable="d">

<Window.SystemBackdrop>
    <DesktopAcrylicBackdrop />
</Window.SystemBackdrop>

<!--<Frame x:Name="myFrame" Background="Red"/>-->
<Grid Background="Red">

</Grid>

Steps to reproduce the bug

Open the window, adjust the zoom from 200% to 100% and after full screen, a white border appears on the window

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.6.0: 1.6.240829007

Windows version

Windows 11 (21H2): Build 22000

Additional context

No response

[deisier]

Remember to adjust the browser's theme color, otherwise you won't see the white border