Application crash on macOS after closing the Py-QT5 window.

[HawaiAl]

Hello.
There is a big problem with macOS Ventura 13.1.
I've made the simplest app for macOS 64-bit - one Form, one Button. It executes a very simple python script.

Everything works fine, but after closing the chart window, the application crashes with a message in a PAServer:
objc_disposeClassPair: class 'FMXWindow' still has subclasses, including 'NSKVONotifying_FMXWindow’!

In larger projects, the effect is stranger. What can be done to solve this problem?

P.S. It is also interesting that after running the script, the application icon changes to the Matplotlib icon.

unit MainUnit;
interface
uses
   PythonEngine,
   System.Classes,
   FMX.Forms, FMX.Controls, FMX.Controls.Presentation, FMX.StdCtrls, FMX.Types;

type
   TFormMain = class(TForm)
      ButtonRun: TButton;
      procedure FormCreate(Sender: TObject);
      procedure ButtonRunClick(Sender: TObject);
      private
         py: TPythonEngine;
   end;

var
   FormMain: TFormMain;

implementation
{$R *.fmx}

procedure TFormMain.FormCreate(Sender: TObject);
begin
   // Create python engine
   py                     := TPythonEngine.Create(Self);
   py.UseLastKnownVersion := True;
   py.FatalAbort          := False;
   py.FatalMsgDlg         := False;
   // Load DLL
   py.LoadDll;
end;

procedure TFormMain.ButtonRunClick(Sender: TObject);
begin
   // Simple script, that uses matplotlib and Py-QT5
   var s: ANSIString := 'import matplotlib.pyplot as plt'#10
         + 'plt.plot([1.6, 2.7])'#10
         + 'plt.show()';
   py.ExecString(s);
end;

end.

[pyscripter]

@lmbelo Any idea what this error message means?

[lmbelo]

I will try to reproduce it here and reply with further details.

[pyscripter]

@lmbelo Any progress on this one?

[lmbelo]

@pyscripter I still didn't investigate this case. Checking it as soon as possible.