False positive unpacking-non-sequence on classmethod + property

[rominf]

Bug description

class E:
    @classmethod
    @property
    def p(cls):
        return 0, 42


x, y = E.p

Configuration

No response

Command used

pylint a.py

Pylint output

************* Module a
a.py:8:0: E0633: Attempting to unpack a non-sequence defined at line 2 (unpacking-non-sequence)

Expected behavior

No output, it's allowed in Python 3.9: https://docs.python.org/3/library/functions.html#classmethod

Pylint version

pylint 2.9.6
astroid 2.6.6
Python 3.9.6 (default, Jul 16 2021, 00:00:00) 
[GCC 10.3.1 20210422 (Red Hat 10.3.1-1)

OS / Environment

Fedora 33

Additional dependencies

No response

[luinnar]

This also applies to "standard" class properties:

class Test:
    OPTIONAL_TUPLE: tuple[str, str] | None = None

    def test(self) -> None:
        if self.OPTIONAL_TUPLE is None or len(self.OPTIONAL_TUPLE) != 2:
            raise ValueError("No, no, no")

        _, var1 = self.OPTIONAL_TUPLE

types.py:11:8: E0633: Attempting to unpack a non-sequence defined at line 5 (unpacking-non-sequence)