Pivot unexpectedly taking all horizontal space.

[Qiu233]

Describe the bug

Pivot will take all horizontal space of the containing window, making other controls invisible.

Steps to reproduce the bug

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto"/>
        <ColumnDefinition Width="Auto"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <Pivot>
        <PivotItem Header="Test"/>
    </Pivot>
    <Border Background="Red" Width="200" Height="200" Grid.Column="1"/>
</Grid>

Expected behavior

In the above code, a red block is expected be visible to the right side of Pivot, but it doesn't.
But when Grid.Column=1 changed to Grid.Row=1, the red block is visible at bottom.

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.4.2: 1.4.231008000

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response