dotnet-svcutil net.pipe://localhost/xxx not working

I have created a WCF service using named pipe connection. But when I tried to generate the reference.cs for its client app, it failed with the following error.

Error: The directory 'H:\Dev\DevProj\TestWcfCli\net.pipe:\localhost' could not be found. Verify that the directory exists and that you have the appropriate permissions to read it.

It seems treating the URI as a directory. If the utility does not work with named pipe end point, please change the error as so.

By the way, the test utility WCFTestClient.exe can find the WCF server and works properly.