what would be the correct way to use navigationID in NavigationCompleted events?

[emaayan]

according to https://learn.microsoft.com/en-us/dotnet/api/microsoft.web.webview2.core.corewebview2.navigationcompleted?view=webview2-dotnet-1.0.2210.55
there's no URI string that was used in CoreWebView2NavigationCompletedEventArgs, only navigation id , for reasons beyond me and others, so aside from using the source property (which may not always be updated from what i understand) what would be a consistent way of getting the uri that was used in CoreWebView2NavigationStartingEventArgs
are we expected to maintain a Dictionary<ulong,URI> on a class level and for each NavigationStarting event put the navigationID into the dictionary and on each NavigationCompleted do tryRemove?
does the dictionary need to concurrecnt dictionary?
are there any code samples which detail this usage?