How to debug asp.net core async method using Source Link?

Question

I am trying to debug asp.net core internals to see what is going on under the hood.

I set up .net core debugging in VS Code according to this article: https://github.com/OmniSharp/omnisharp-vscode/wiki/Debugging-into-the-.NET-Framework-itself

Now I get .net core sources automatically while debugging and can step into methods, but not async ones. Since I have no source code at hand (it loads on the fly from somewhere) I cannot set a breakpoint in an async method to make debugger stop there.

I have the following controller method. How can I step into HttpContext.SignInAsync(...) method in VS Code debugger?

public async Task<IActionResult> Login(LoginModel model)
{
    ...
    await HttpContext.SignInAsync(principal);
    ...
}

Update #1

Same thing for Visual Studio 2019. So it does not matter if I use VS Code or VS 2019.

Hekking

I'm also experiencing this issue. When stepping into an async method, the debugger steps into the internal state machine and not the method itself. – Earnestineearnings