Why does windows.xam.ul api change the binding of a webview2 source using communitywinui 8.02.

[JohnDizzle]

What happened?

I was debugging my application and used a binding onthe source property;
xaml <Webview2 source="{x:Bind ViewModel.Source, mode=TwoWay, updateSourceProperty }:/>
private uri _source = default;
public uri Source { get { return _source; } set { SetProperty(ref _source, value); }.
I set the break point on the set property, and I seen the requested uri set, and then the windows.ui.xaml api set it to "about:blank" this occurred a couple of times, although binding was finally correct.
I was wondering why does this happen, and a fallbackvalue doesn't work either.

Importance

Moderate. My app's user experience is affected, but still usable.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

1.4.231115000

SDK Version

1.4.231115000

Framework

WinUI3/WinAppSDK

Operating System

Windows 10

OS Version

22621

Repro steps

Create a page with the webview2 and bind using communitywinui observablereceiptant, and create a binding and set a break point on the setter.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

Don't know

Last working version (if regression)

1.4.231115000