type narrowing with `isinstance` does not work in combination with `and` and `or`

[jgogstad]

Bug Report

Type narrowing with isinstance doesn't happen if it's used in a conditional statement with and or or

To Reproduce

https://mypy-play.net/?mypy=latest&python=3.13&flags=strict&gist=fb4efdf001e261dd16d2605c7488537e

from typing import Any


def foo() -> str:
    a: dict[str, Any] = {"foo": "bar"}
    foo = a.get("foo")
    if foo and isinstance(foo, str):
        return foo

    return ""

it works if we remove the and:

from typing import Any


def foo() -> str:
    a: dict[str, Any] = {"foo": "bar"}
    foo = a.get("foo")
    if isinstance(foo, str):
        return foo

    return ""

Expected Behavior

isinstance should narrow the type regardless of whether it's used in a conjunction or not

Your Environment

• Mypy version used: 1.18.2
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.13.9