python3 ~/pyside2705_1.py 
Python 3.10.12
Qt 6.7.1 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 11.4.0) [Python 3.10.12]
Fail1 PyObject(False) err= PyObject(0)
/pyside2705_1.py:17: RuntimeError: Failed to disconnect (<bound method Window.Slot of <__main__.Window(0x558a2448eac0) at 0x7f4306ec72c0>>) from signal "signal()".
  self.signal.disconnect(self.Slot)

python3 pyside2705_2.py
Python 3.10.12
Qt 6.7.1 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 11.4.0) [Python 3.10.12]
Fail1 PyObject(False) err= PyObject(0)
/pyside2705_2.py:9: RuntimeError: Failed to disconnect (<bound method MyClass.empty of <__main__.MyClass object at 0x7f11dd18d5d0>>) from signal "timeout()".
  self.timer.timeout.disconnect(self.empty)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)
Fail1 PyObject(False) err= PyObject(0)

python3  pyside2705_3.py
Python 3.10.12
Qt 6.7.1 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 11.4.0) [Python 3.10.12]
- no warning:
- warning:
Fail1 PyObject(False) err= PyObject(0)
/pyside2705_3.py:12: RuntimeError: Failed to disconnect (<bound method MyClass.cleanup of <__main__.MyClass object at 0x7f2920d31960>>) from signal "timeout()".
  self.timer.timeout.disconnect(self.cleanup)