TPythonType.Finalize needs to reset tp_pythontype and Tag.

Author: pyscripter

Source/PythonEngine.pas

@@ -8645,6 +8645,10 @@ procedure TPythonType.Finalize;
   if Assigned(Engine) then
     Engine.Py_CLEAR(FCreateFunc);
   FCreateFunc := nil;
+
+  FType.tp_pythontype := nil;
+  Tag := 0; // TPyDelphiObject stores the default indexed property
+
   inherited;
 end;