Setting SelectionFollowsFocus causes focus rect to not render

[YuliKl]

Describe the bug

When NavigationView's SelectionFollowsFocus="Enabled", the menu items no longer render focus rects while they have keyboard focus.

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Create new test app with

    <muxc:NavigationView PaneDisplayMode="Auto" SelectionFollowsFocus="Enabled">
        <muxc:NavigationView.MenuItems>
            <muxc:NavigationViewItem Icon="Play" Content="Menu Item1" Tag="SamplePage1" />
            <muxc:NavigationViewItem Icon="Save" Content="Menu Item2" Tag="SamplePage2" />
        </muxc:NavigationView.MenuItems>
        <Frame x:Name="contentFrame">
            <Grid>
                <Button>Hello</Button>
            </Grid>
        </Frame>
    </muxc:NavigationView>

2. Tab through the controls in the app
3. Note that the focus rect disappears between hamburger and settings buttons.
4. Change SelectionFollowsFocus to Disabled.
5. Note focus draws as expected.

Expected behavior

When one of the MenuItems has keyboard focus, a focus rect is drawn around it.

Screenshots

Additional context

Copied from internal bug

[marcelwgn]

I would like to look into this.