WPF ui navigationview XAML binding failures with PaneDisplayMode="Top"

Question

<ui:NavigationView
    x:Name="NavigationView"
    Grid.Row="1"
    EnableDebugMessages="True"
    Margin="10"
    IsBackButtonVisible="Collapsed"
    IsPaneToggleVisible="False"
    BreadcrumbBar="{Binding ElementName=BreadcrumbBar}"
    MenuItemsSource="{Binding MenuItems, Mode=TwoWay}"
    FooterMenuItemsSource="{Binding FooterMenuItems, Mode=TwoWay}"
    PaneDisplayMode="Top">
    <ui:NavigationView.Header>
        <StackPanel Margin="2">
            <ui:BreadcrumbBar x:Name="BreadcrumbBar" />
        </StackPanel>
    </ui:NavigationView.Header>
    <ui:NavigationView.ContentOverlay>
        <Grid>
            <ui:SnackbarPresenter x:Name="SnackbarPresenter" />
        </Grid>
    </ui:NavigationView.ContentOverlay>
</ui:NavigationView>

<ContentPresenter x:Name="RootContentDialog" Grid.Row="0" />

When I set PaneDisplayMode="Top", I received warning:

Popup.PlacementTarget, Name='SubMenuPopup' Cannot find source: ElementName=Border.

So, what cause this happened and how to fix it?

I tried but couldn't find any information about this error, when I set PaneDisplayMode=Left/Bottom this error does not occur.