TSynEdit crashes when loading text

• Lazarus/FPC Version: Lazarus 2.2.2 (rev lazarus_2_2_2) FPC 3.2.2 x86_64-win64-win32/win64
• Operating System: Windows 10 Home
• CPU / Bitness: 64

What happens

When the button is clicked 2 times the program crashes

What did you expect

Not crash

Steps to reproduce

Just click twice the button

    procedure TForm1.Button1Click(Sender: TObject);
    var Str: String;
        L: TStringList;
    begin
      L := TStringList.Create;
      L.LoadFromFile('test.htm');
     
      Str := L.Text;
      L.Free;
     
     SynEdit1.Text:=Str; //crashes
    end;

Full code: https://forum.lazarus.freepascal.org/index.php/topic,63540.0.html