class Stat:
    @property
    def owner(self):
        print("--> accessing owner")
        raise NotImplementedError("owner not implemented")

    def __getattr__(self, item):
        return getattr(1, "foobar")


s = Stat()
s.owner

λ py -3.11 --version
Python 3.11.2

λ py -3.11 .tmp\reproducer.py
--> accessing owner
Traceback (most recent call last):
  File "e:\projects\pytest\.tmp\reproducer.py", line 12, in <module>
    s.owner
  File "e:\projects\pytest\.tmp\reproducer.py", line 5, in owner
    raise NotImplementedError("owner not implemented")
NotImplementedError: owner not implemented

λ py -3.12 --version
Python 3.12.0a7

λ py -3.12 .tmp\reproducer.py
--> accessing owner
Traceback (most recent call last):
  File "e:\projects\pytest\.tmp\reproducer.py", line 12, in <module>
    s.owner
  File "e:\projects\pytest\.tmp\reproducer.py", line 8, in __getattr__
    return getattr(1, "foobar")
           ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'int' object has no attribute 'foobar'

class Stat:
    @property
    def owner(self):
        print("--> accessing owner")
        raise NotImplementedError("owner not implemented")

    def __getattr__(self, item):
        raise AttributeError("foobar")


s = Stat()
s.owner

λ py -3.12 .tmp\reproducer.py
--> accessing owner
Traceback (most recent call last):
  File "e:\projects\pytest\.tmp\reproducer.py", line 5, in owner
    raise NotImplementedError("owner not implemented")
NotImplementedError: owner not implemented

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "e:\projects\pytest\.tmp\reproducer.py", line 12, in <module>
    s.owner
  File "e:\projects\pytest\.tmp\reproducer.py", line 8, in __getattr__
    raise AttributeError("foobar")
          ^^^^^^^^^^^^^^^^^^^^^^^^
SystemError: <class 'AttributeError'> returned a result with an exception set