Found markup element with unexpected name 'Routes'

[robbiedigitalplanning]

When creating a new Blazor project with Identity and interactivity, the following error is shown in App.razor:
Found markup element with unexpected name 'Routes'. If this is intended to be a component, add a @using directive for its namespace.

Steps to reproduce:

1. Using dotnet CLI run dotnet new blazor -au Individual -ai true
2. Open project in VSCode
3. View App.razor

The project builds and runs just fine, but the error is annoying and confusing to new users.

Adding using command to App.razor does not resolve the issue.
@using Microsoft.AspNetCore.Components.Routing

[phil-allen-msft]

We're sorry you are running into this. We likely have a change in the works that should help to resolve this; you can follow the status on #10547 and we will update it with a VS Code build number when we know what the specific version is.