Edit and Continue failed in ASP.NET Core web project

Describe the bug

Error CS8055: “Cannot emit debug information for a source text without encoding.” is reported when editing ASP.NET Core web project while debugging.

Reported as VS feedback: https://developercommunity.visualstudio.com/content/problem/414645/edit-and-continue-not-working-with-aspnet.html. Internal bug 736856.

To Reproduce

1. Create a C# ASP.NET Core Web Application (MVC). ASP.NET Core 3.0.
2. Set a break point in Index method in HomeController.cs.

public IActionResult Index()
{
   // int i = 1;
   return View();
}

1. F5 (The platform is AnyCPU).
2. Uncomment // int i = 1;
3. F10

Expected

ENC is successful.

Actual

ENC failed with error CS8055: “Cannot emit debug information for a source text without encoding.”