[fpc-pascal] Array issue

[Thomas Kurz]

Dear all,

I'm observing a strange array issue. Please consider this code:

```
program ArrayTest;

{$MODESWITCH ARRAYOPERATORS}

var x, y: packed array of PtrInt; i: Integer;

begin
  x := [0,0];

  y := System.Copy (x, 0, Length(x)-2) + [234, 567] + [0, 0];
  // prints [0,0,0,0]
  for i := Low(y) to High(y) do writeln (y[i]);

  y := System.Copy (x, 0, Length(x)-2);
  y := y + [234, 567];
  y := y + [0, 0];
  // prints [234,567,0,0]
  for i := Low(y) to High(y) do writeln (y[i]);
end.
```

To me, both assignments to `y` are equal in the end. But the first one results in `y = [0,0,0,0]`, while the second one correctly gives me `y = [234,567,0,0]`.

I'm on Windows 64, trunk 3.3.1 (Free Pascal Compiler version 3.3.1 [2026/03/11] for x86_64) and would appreciate if anyone could try to reproduce this behavior. Or explain it to me :)

Kind regards,
Thomas