Implicit Function Specialization broken with overload and string

Summary

I updated to today FPC and a complicated project got broken on compile with multiple internal errors and exceptions in compiler. I can not find the reason or the commit that broke FPC, but I managed to make a minimal sample to show the weird case. Can anyone who maybe changed related mechanism check this? I got stuck with no way to fix as the whole code has units and cases like this.

Error is Error: Internal error 2021020904.

System Information

Lazarus 4.99 (rev dfb7c2bd04) FPC 3.3.1 x86_64-win64-win32/win64

Example Project

program project1;

{$mode delphi}
{$modeswitch implicitfunctionspecialization}

uses
  Unit1;

  procedure Test(A: string; B: string); overload;
  begin
  end;

  procedure Test<T>; overload;
  begin

  end;

begin
  Test('aa', 'bb');
end.                           

unit Unit1;

{$mode delphi}

interface

procedure Test<T>(A: T); overload;

implementation

procedure Test<T>(A: T);
begin

end;

end.

What is the current bug behavior?

• FPC can not choose the correct procedure.
• If I change the parameters to 'a' and 'b' it will work as their type changes to char. Seems irreverent to the issue.
• If I remove the Unit1, it will work.
• If I move the procedure from Unit1 to project, it will work.