[regression/8.0.0-preview.1.7762] [WinUI] CollectionView runtime binding errors when loading the ItemSource asynchronously

[nicop85]

Description

I was testing the last updates available for the Net 8 preview 6 (using Visual Studio 17.7), to see if everything continues to works as expected.

What I have found is that if you have a CollectionView that uses data binding inside it's DataTemplate, WinUI will report some binding problems if you load the ItemSource asynchronously like when you go to some API to get the data and then fill the ItemSource list with that data.

If you load the ItemsSource without waiting for an asynchronous response, everything work as expected.

App after showing the list:

Binding errors:

Steps to Reproduce

1. Download the project linked below
2. Run it targeting Windows

Link to public reproduction project repository

https://github.com/nicop85/CollectionViewBindingProblems.git

Version with bug

8.0.0-preview.1.7762

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

7.0.92

Affected platforms

Windows

Affected platform versions

Windows 10.0.17763.0

Did you find any workaround?

No

Relevant log output

No response

[mattleibow]

@StephaneDelcroix thoughts?

[samhouts]

Could be the same as #11956 or #8433 or #13754 or #15579