Extract Method on part of an expression generates invalid code

[thetuvix]

Version Used:
Visual Studio 2019 version 16.2.2

Steps to Reproduce:

1. Add the following code to a class:

private void Repro()
{
    int i = 1, j = 2;
    int k = i + j + 1;
}

2. Select i + j and perform an Extract Method refactoring.

Expected Behavior:
Extract Method generates NewMethod(int i, int j):

private void Repro()
{
    int i = 1, j = 2;
    int k = NewMethod(i, j) + 1;
}

private static int NewMethod(int i, int j)
{
    return i + j;
}

Actual Behavior:
Extract Method generates NewMethod() without parameters to pass in i and j:

private void Repro()
{
    int i = 1, j = 2;
    int k = NewMethod() + 1;
}

private static int NewMethod()
{
    return i + j;
}

[RikkiGibson]

This could be a problem in IDE code or in dataflow analysis. We'll see once we take a closer look at the bug.