Version Used:
VS 17.3 or later (up to 17.5 preview 6)

I have posted an issue in VS feedback before, but no reply except asking me for reproducing steps.

Steps to Reproduce:

1. A C# file with the following code.
2. Select if (a == 1) { return "err"; }
3. Execute the Extract Method command.
4. Press Yes in the prompt dialog.
5. Nothing happened

using System;

public class Class1
{
	public string M()
	{
		var a = 1;
		if (a == 1) {
			return "err";
		}
		if (a == 2) {
			return "ok";
		}
	}
}

Expected Behavior:
In previous versions, if we pressed Yes in the prompt dialog, the refactor continued and we could manually deal with the broken code.

Actual Behavior:
No matter we press Yes to continue or No to cancel, nothing is changed.