There is a bug when NavigationView in Flyout?

[doghappy]

Describe the bug
When the NavigationView is in the Flyout control and Flyout first expands, the NavigationView works, but if Flyout loses focus(Flyout is closed), click the Button again, all NavigationViewItem cannot be clicked.

Steps to reproduce the bug

XAML

<Button Content="flyout2">
    <Button.Flyout>
        <Flyout>
            <NavigationView x:Name="nvSample" PaneDisplayMode="Top">
                <NavigationView.MenuItems>
                    <NavigationViewItem Icon="Play" Content="Menu Item1" Tag="SamplePage1" />
                    <NavigationViewItem Icon="Save" Content="Menu Item2" Tag="SamplePage2" />
                    <NavigationViewItem Icon="Refresh" Content="Menu Item3" Tag="SamplePage3" />
                    <NavigationViewItem Icon="Download" Content="Menu Item4" Tag="SamplePage4" />
                </NavigationView.MenuItems>
                <Frame x:Name="contentFrame"/>
            </NavigationView>
        </Flyout>
    </Button.Flyout>
</Button>

Windows 10 version	Saw the problem?
October 2018 Update (17763)	Yes

Device form factor	Saw the problem?
Desktop	Yes

[doghappy]

May be caused by Flyout cache Content

[jevansaks]

This sounds like #18 which is fixed in the latest prerelease MUX. Could you give this nuget package a try? (You would need to switch your usage of NavigationView from the SDK to Microsoft.UI.Xaml)