Property union type inference issue: E1102 not-callable false positive

[Julfried]

Bug description

Pylint incorrectly reports E1102: not-callable when calling a property that returns a union type with None, even after explicit None checking.

The issue occurs when:

1. A property returns CallableType | None
2. Code explicitly checks if self.property: before calling
3. The callable type has a __call__ method

Minimal reproduction:

from abc import ABC, abstractmethod


class CallableBase(ABC):
    """Simple callable abstract base class."""
    
    @abstractmethod
    def __call__(self, data: str) -> str:
        pass


class ConcreteCallable(CallableBase):
    """Concrete implementation."""
    
    def __call__(self, data: str) -> str:
        return f"processed: {data}"


class Container:
    """Demonstrates the property inference issue."""
    
    def __init__(self, processor: CallableBase | None = None):
        self.__processor = processor
    
    @property
    def processor(self) -> CallableBase | None:
        """Property returning union type - causes pylint issue."""
        return self.__processor
    
    def process_with_property(self, data: str) -> str:
        """Uses property - pylint incorrectly flags as not-callable."""
        if self.processor:  # Clearly checks for None
            return self.processor(data)  # pylint: E1102 not-callable
        return data
    
    def process_with_attribute(self, data: str) -> str:
        """Uses direct attribute - pylint works fine."""
        if self.__processor:  # Same logic, different access
            return self.__processor(data)  # No pylint error
        return data

Command used

pylint test.py

Pylint output

************* Module test
test.py:35:19: E1102: self.processor is not callable (not-callable)

------------------------------------------------------------------
Your code has been rated at 7.92/10 (previous run: 7.83/10, +0.09)

Expected behavior

Do not emit a message here

Pylint version

pylint --version
pylint 4.0.0-dev0
astroid 4.0.0b0
Python 3.13.5 (main, Jul  1 2025, 18:31:42) [MSC v.1944 64 bit (AMD64)]

OS / Environment

Windows 10