Incorrect error about uninitialized out parameter in extern local function

[TessenR]

Version Used:

Branch master (18 Nov 2020)
Latest commit 823039e by David Wengier:
Create an unsafe method from a local function when necessary (#49389)

Steps to Reproduce:

using System.Runtime.InteropServices;

class C
{
  void M()
  {
    [DllImport("asdf")]
    static extern void Local(out int x); // error CS0177
  }
    
  [DllImport("asdf")]
  static extern void Method(out int x); // no errors
}

Expected Behavior:
No errors

Actual Behavior:
error CS0177: The out parameter 'x' must be assigned to before control leaves the current method is reported for Local but not for Method

Note that as the function is extern it isn't allowed to have a body so it's impossible to fix the error