False Positive when TypedDict instance used as base __map for new instances?

Bug Report

Why doesn't mypy accept another TypedDict as the __map argument when defining a new instance as shown below? It seems perfectly valid to me, but I could be missing something.

To Reproduce

Save the following as test_mypy.py and ask mypy to check it:

from typing import TypedDict


class MyTypedDict(TypedDict):
    attr1: str
    attr2: str
    attr3: str


MY_BASE_DICT = MyTypedDict(
    attr1="testing",
    attr2="typeddict",
    attr3="inheritance",
)

new_typed_dict = MyTypedDict(MY_BASE_DICT, attr1="failing")

assert " ".join(new_typed_dict.values()) == "failing typeddict inheritance"

Expected Behavior

> mypy test_mypy.py
Success: no issues found in 1 source file

Actual Behavior

> mypy test_mypy.py
test_mypy.py:17: error: Expected keyword arguments, {...}, or dict(...) in TypedDict constructor  [misc]
Found 1 errors in 1 file (checked 1 source file)

Your Environment

• Mypy version used: v1.8.0 (command line call) and v1.6.1 (integrated vscode extension)
• Mypy command-line flags: none required although I'm typically adding --check-untyped-defs --implicit-optional
• Mypy configuration options from mypy.ini (and other config files): n/a
• Python version used: 3.10.6

Reproduce el informe guardando el ejemplo como test_mypy.py y ejecutando mypy test_mypy.py. Sigue la comprobación del constructor de TypedDict que rechaza MY_BASE_DICT y, a continuación, añade una prueba de regresión para usar una instancia de TypedDict como mapeo base, manteniendo las sobrescrituras mediante palabras clave. Se considera terminado cuando el ejemplo pasa sin el error [misc].