Reproduced on 3.11:

>>> foo = mock.create_autospec(Foo)
>>> mock.seal(foo)

^CTraceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 2917, in seal
    seal(m)
    ^^^^^^^
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 2917, in seal
    seal(m)
    ^^^^^^^
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 2917, in seal
    seal(m)
    ^^^^^^^
  [Previous line repeated 645 more times]
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 2911, in seal
    m = getattr(mock, attr)
        ^^^^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 662, in __getattr__
    result = create_autospec(
             ^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 2672, in create_autospec
    mock = Klass(parent=_parent, _new_parent=_parent, _new_name=_new_name,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython-1/Lib/unittest/mock.py", line 416, in __new__
    new = type(cls.__name__, bases, {'__doc__': cls.__doc__})
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyboardInterrupt