Possible BUG but Please help to understand how Webview2 should work with WPF MVVM concepts.

I am working on a WPF app with dynamically added TabItems. Further I am attempting to follow MVVM concepts.

I have set up an example repo Example WPF TabControl

In the example repo the TabControl's ItemSource is set to an ObservableCollection (name: TabCollection) of a UserControl's (name: BrowserTabItemUC) view model (name: BrowserTabItemViewModel). This UserControl holds the WebView2 control.

To set up the TabItem I have a ContentTemplate as follows;

       <DataTemplate x:Key="TabBrowserDataTemplate"
                     DataType="{x:Type local:BrowserTabItemViewModel}">
           <Grid>
               <local:BrowserTabItemUC />
           </Grid>
       </DataTemplate>

When a new tab is requested I add a new instance of the viewmodel to the TabCollection. This is where I have issues with creating the new WebView2. I am currently able to add a new Source to WebView2 from the ViewModel as Source is a Dependency property of the Webview2, however, how does one add an existing environment? This question is also my main issue with trying to implement MVVM concepts. CoreWebView2 is not a Dependency Property and thus all of these properties, methods and events are not available to a view model.

Generally I am wondering how the WebView2 should work in such a case, especially for WPF TabControl as the whole WebView2 re-initializes when manually changing tabs.

Possible bug
In my example simply close a second tab. When the collection attempts to remove the item I get an error with respect to the Source property being null. See the pic.

I cannot reproduce a second error i sometimes get. When manually changing tabs sometimes the Source become null as well and WebView2 does not like this null value as well. As i said i cannot reproduce this all the time so am assuming it is my code.

AB#32376214