🚀 go-pugleaf

Since a few weeks I use Delphi 4 (German, Update Pack #2).
I noticed a strange behaviour while debugging the following code:

{$OPTIMIZATION OFF}
procedure TForm1.Button2Click(Sender: TObject);
var
  l: TList;
  a: TAdresse;
  p: Pointer;
begin
  l := TList.Create;
  try
    a := TAdresse.Create('Smith', 'Washington');
    l.add(a);
    p := l[0];
  finally
    l.Free; /* set the breakpoint here */
  end;
end;

When you run the program that contains this method and let it stop at
the
shown position, you can inspect the following expressions:
1) l[0]
2) TAdresse(l[0])
3) p
4) TAdresse(p)
Since p is given the value of l[0] both variables should behave in the
same way.
But they don't. l[0] is evaluated correctly and contains the same value
as p.
But while the type conversion of p to TAdresse is possible and shows
('Smith', 'Washington')
the debugger is not able to inspect the second expression
(TAdresse(l[0]).
Why is the same type conversion as in No. 4 impossible in this
situation?

Thanks for any help

Dominik Luebbers