erroneous complaint that overloaded function implementation does not accept all possible arguments of signature

Bug Report

Erroneous complaint that overloaded function implementation does not accept all possible arguments of signature.

To Reproduce

from datetime import datetime
from typing import overload

class Sample:

    @overload
    @classmethod
    def set(cls, year: int) -> None:
        ...

    @overload
    @classmethod
    def set(cls, instance: datetime, / ) -> None:
        ...

    @classmethod
    def set(cls, *args: datetime | int, **kw: int) -> None:
        pass

Expected Behavior

The above should pass type checking.

Pyright's happy enough:

$ pyright typing_bug.py 
0 errors, 0 warnings, 0 informations 

Actual Behavior

$ mypy typing_bug.py 
typing_bug.py:16: error: Overloaded function implementation does not accept all possible arguments of signature 1  [misc]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.14.1 (compiled: yes)
• Mypy command-line flags: None, see above
• Mypy configuration options from mypy.ini (and other config files): None.
• Python version used: Python 3.12.1

Reproduce the report from typing_bug.py with mypy 1.14.1 and compare the result with pyright. Trace the overload implementation compatibility check for the classmethod example; done means mypy accepts the shown code without the erroneous complaint while preserving valid diagnostics for incompatible implementations.