[BUG] moving a C# project and then trying to delete the original folder fails with EBUSY

Describe the Issue

I created a test project (Blazor WebApp, interactive WebAssembly) and wanted to move the projects to the top level.

In the Explorer view, I moved the Site.Client folder to the solution-level folder (without error), then moved the contents of the Site (server project) folder (without error).

Then to clean-up the old server project folder tried to delete it.

my assumption is that it is locked because it contained a project referenced by the solution, which now has moved.

Steps To Reproduce

1. create new project, Blazor WebApp, interaction WebAssembly
2. move the Site.Client up one level to the root folder (workspace\Site\Site.Client => workspace\Site.Client)
3. move all contents of the Site (server project) project up one level (workspace\Site\Site => workspace\Site)
4. attempt to delete the now empty Site folder (workspace\Site\Site)
5. receive error:

[Window Title]
Visual Studio Code

[Content]
Error: EBUSY: resource busy or locked, rmdir 'd:\source\xxx\DynamicalStateArchitectureTest\FrontendSite\FrontendSite'

[Retry] [Cancel]

Expected Behavior

moving folders and project files referenced by a solution does not cause long pauses, EBUSY or "Access Denied" errors.

Environment Information

No response

Start by reproducing the folder moves in the issue using a Blazor WebApp with interactive WebAssembly in Visual Studio Code. Investigate why deleting the now-empty original server-project folder returns EBUSY; done means the move and cleanup complete without long pauses, EBUSY, or access-denied errors.