Variant as Parametr in x64

[Varera]

This code works fine in 32-bit mode, but in x64 the var2str_func function passes the parameter Unassigned.
A rule parameter is passed to var2str

procedure TForm26.btn1Click(Sender: TObject);
var
PSS: TPSScript;
begin
PSS := TPSScript.Create(nil);
try
PSS.OnCompile := PSSCompile;
PSS.Script.Text := 'begin var2str(12); var2str_func(13); end.';
if PSS.Compile then PSS.Execute;
finally
FreeAndNil(PSS);
end;
end;

function TForm26.var2str(AValue: Variant): string;
begin
Result := AValue;
end;

function var2str_func(const AValue: Variant): string;
begin
Result := AValue;
end;

procedure TForm26.PSSCompile(Sender: TPSScript);
begin
Sender.AddFunction(@var2str_func, 'function var2str_func(const AValue: Variant): string;');
Sender.AddMethod(Self, @TForm26.var2str, 'function var2str(AValue: Variant): string;');
end;