ParamSpec with Concatenate issue when function has union and kw args with strict=True

Hi,

Found a strange issue triggered by strict only when kw-args are present in the function.
Below I believe that both function should either pass or fail (I think the correct behavior is pass here)
For reference pyright finds no issues in this snippet

Bug Report

(A clear and concise description of what the bug is.)

To Reproduce

# Ideally, a small sample program that demonstrates the problem.
# Or even better, a reproducible playground link https://mypy-play.net/ (use the "Gist" button)

from typing import Any, Callable, Concatenate, ParamSpec, TypeVar
P = ParamSpec("P")
T = TypeVar("T")

def go(x: Callable[Concatenate[str, P], T], *a: P.args, **k: P.kwargs) -> T:
    return x("foo", *a, **k)

def ok(a: str | int, one: int) -> int:
    return 1

def error(a: str | int, one: int, **kw: Any) -> int:
    return 2

go(ok, 1)
go(error, 1)

mypy playground link here: https://mypy-play.net/?mypy=latest&python=3.12&flags=strict&gist=22221f205a86573a0c4db8cb529dc824

Expected Behavior

No error is reported

Actual Behavior

main.py:15: error: Argument 1 to "go" has incompatible type "Callable[[str | int, int, KwArg(Any)], int]"; expected "Callable[[str, int, KwArg(Any)], int]"  [arg-type]
main.py:15: note: This is likely because "error" has named arguments: "a". Consider marking them positional-only
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.9.0
• Mypy command-line flags: --strict
• Mypy configuration options from mypy.ini (and other config files): -
• Python version used: 3.12

Inizia eseguendo lo snippet Python fornito nel mypy playground collegato con Python 3.12 e --strict, quindi confronta le diagnosi per go(ok) e go(error). Il lavoro è concluso quando il caso ParamSpec e Concatenate si comporta in modo coerente con l’aspettativa indicata e dispone di una copertura di regressione in mypy.