Add scaffolded Blazor Identity to Aspire Starter App fails with 'value cannot be null or empty Parameter name: projectRelativePath'

[tomg2015]

Adding a scaffolded Blazor Identity to the Aspire Starter App fails with 'value cannot be null or empty Parameter name: projectRelativePath'.

The problem may be due to the presence of '.' in the Web project name, since adding scaffolded Identity to another simple Blazor Web App in the same solution succeeds.

Steps to Reproduce

1. New solution: .NET Aspire Starter App, named 'Test1'
   
   With options:
   
   Produces:
   

2. Add Scaffolded Blazor identity to Test1.Web project:
   

3. Create fails with this error:
   
   Code generation seems to be using the wrong path:
   

4. Add a further simple 'Blazor Web App' project 'BlazorApp1' to solution
   

5. Add Scaffolded Blazor identity to BlazorApp1 project:
   

Success:

Include provider and version information

Operating system: OS Name Microsoft Windows Server 2019 Standard
Version 10.0.17763 Build 17763

IDE: Microsoft Visual Studio Community 2022
Version 17.12.0 Preview 2.1
VisualStudio.17.Preview/17.12.0-pre.2.1+35323.107