TitleBar doesn't show Subtitle/Header/Content/Footer

[Poker-sang]

Describe the bug

TitleBar doesn't show the Header/Content/Footer. However when I set it in XAML Hot Reload it appears.

Steps to reproduce the bug

<Window x:Class="App.MainWindow" ...>
    <Grid RowDefinitions="auto,*">
        <TitleBar
            x:Name="TitleBar"
            Title="312"
            Grid.Row="0">
            123
        </TitleBar>
    </Grid>
</Window>

public MainWindow()
{
    InitializeComponent();
    ExtendsContentIntoTitleBar = true;
    SetTitleBar(TitleBar);
}

Expected behavior

Show the Header/Content/Footer

Screenshots

NuGet package version

None

Windows version

Windows Insider Build (xxxxx)

Additional context

WASDK 1.6

[ghost1372]

Subtitle also does not shown, changing focus display it.

[dotMorten]

I'm seeing this behavior too:

titlebarbug.mp4

Looks like it's only functional with hotreload.

[riverar]

I'm curious about how bugs like this make it into the experimental release. Can we review the process to see if there are any areas for improvement?

[ghost1372]

I'm curious about how bugs like this make it into the experimental release. Can we review the process to see if there are any areas for improvement?

It seems they used a different version in ms build And we're using an early version. As you can see here, the title bar works well in ms build.

[ranjeshj]

A perf fix to delay load left the initial load broken. There is a workaround documented in the release notes. The issue is already fixed and will make it into the next release.
https://learn.microsoft.com/en-us/windows/apps/windows-app-sdk/experimental-channel#new-titlebar-control

[riverar]

A bit frustrating that Microsoft slipped this into the docs 5 hours ago and none of the involved parties thought to close the loop here. Thank you @ranjeshj for the heads up! MicrosoftDocs/windows-dev-docs@465e1e1

[ranjeshj]

The fix is checked in, should be available in the next release.