mypy fails to recognise dunder init method override

Bug Report
In an inheritance scenario with pydantic.BaseModel and generics, mypy 1.2.0 fails to recognise an overridden __init__(),
and wrongly reports an error (see "actual behavior").

To Reproduce

from __future__ import annotations

from typing import Generic, List, Type, TypeVar

from pydantic import BaseModel, PrivateAttr

B_co = TypeVar("B_co", bound=BaseModel, covariant=True)

class Container(Generic[B_co], BaseModel):
    """Container is the base class for any item-type specific containers,
    to allow bundling and processing of aggregates
    """

    _item_class: Type[B_co] = PrivateAttr()
    __root__: List[B_co]

    def __init__(self, *args: B_co) -> None:
        super().__init__(__root__=list(args))

    def __len__(self) -> int:
        return len(self.__root__)

    def __getitem__(self, index: int) -> B_co:
        return self.__root__[index]


class Item(BaseModel):
    name: str

class Items(Container[Item]):
    _item_class = Item

items = Items(Item(name="one"), Item(name="two"))
print(items)

Expected Behavior
The overridden __init__ method in the Container class has the correct signature, and mypy should not flag any issues.

Actual Behavior

ttt/ttt.py:33: error: Too many arguments for "Items"  [call-arg]
ttt/ttt.py:33: error: Too many positional arguments for "Items"  [misc]
ttt/ttt.py:33: error: Argument 1 to "Items" has incompatible type "Item"; expected "List[B_co]"  [arg-type]
Found 3 errors in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.2.0
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files):

[tool.mypy]
python_version = "3.10"
strict = true
namespace_packages = false
explicit_package_bases = false
plugins = [
  "pydantic.mypy"
]
follow_imports = "silent"
warn_redundant_casts = true
warn_unused_ignores = true
disallow_any_generics = true
check_untyped_defs = true
no_implicit_reexport = true
disallow_untyped_defs = true

[[tool.mypy.overrides]]
module = [
     "html_text.*"
]
ignore_missing_imports = true
ignore_errors = true

[tool.pydantic-mypy]
init_forbid_extra = true
init_typed = true
warn_required_dynamic_aliases = true
warn_untyped_fields = true

• Python version used: 3.10.10
• Other versions: pydantic=1.10.7, typing-extensions=4.5.0

Commencez par reproduire l’exemple fourni avec mypy 1.2.0 et la configuration présentée. Suivez la manière dont mypy détermine la signature du constructeur pour la sous-classe générique de BaseModel et la manière dont le plugin pydantic l’affecte. C’est terminé lorsque l’exemple passe la vérification de types sans les trois erreurs signalées, tout en préservant le typage prévu du constructeur.