Why don't I get an access violation when I call methods on an uninitialized function result?

One of my coworkers show me a code written in Delphi-XE XE Version 15.0.3953.35171, which I believe it should raise an access violation. The code is bellow:

unit Unit3;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TForm3 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
   function test:TstringList;
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

{$R *.dfm}

procedure TForm3.FormCreate(Sender: TObject);
var aStrList : TStringList;
begin
 aStrList := TStringList.Create;
 test;
 FreeAndNil(aStrList);
end;

function TForm3.test: TstringList;
var i:Integer;
begin
 for i:=0 to 1000 do
  Result.Add('aaa');//AV?
end;

end.

Inspecting aStrList and Result has the following results:

aStrList: TStringList $12FEDC : $42138A


Result: TStringList $12FEC4 : $B01B90

I do not understand why it is working. Result.Add should raise an access violation

LE: It seems that is working only on Debug Build Configuration.