Mypy warning on blueprint

[gbrandt]

Mypy gives me the following warning on my @blueprint lines since upgrading Flask from 2.1.2 to 2.1.3:

Value of type variable "ft.RouteDecorator" of function cannot be "Callable[[], Status]" [type-var]mypy

Moving to 2.2.2 gives a different error from Mypy:

Value of type variable "T_route" of function cannot be "Callable[[], Status]" [type-var]mypy

example:

my_blueprint = Blueprint("name_of_blueprint", __name__)

@my_blueprint.route('/', methods=['GET'])  # <-----  error occurs here
def....

I can't figure out what's going on, any ideas?

UPDATE

found: #4695 with an explanation.