Incorrect error when argument missing from function call unpacking TypedDict

Bug Report

When supplying arguments by unpacking a TypedDict, and the TypedDict does not supply all the parameters, mypy seems to treat it as only supplying the first parameter, even if that is the one that is missing.

To Reproduce

from typing import TypedDict

def my_function(foo: int, bar: int) -> None:
    pass

class MyTypedDict(TypedDict):
    # foo: int
    bar: int

    
a: MyTypedDict = {'bar': 1}

my_function(**a) # mypy - error: Missing positional argument "bar" in call to "my_function"
my_function(bar=1) # mypy - error: Missing positional argument "foo" in call to "my_function"

https://mypy-play.net/?mypy=0.931&python=3.11&flags=strict&gist=c72be0814d2e7684453f2a8825f2e986

Expected Behavior

The line my_function(**a) should result in mypy error error: Missing positional argument "foo" in call to "my_function", as it only supplies bar.

Actual Behavior

The line my_function(**a) resulted in mypy error error: Missing positional argument "bar" in call to "my_function".

When executed, python gave this error:

TypeError: my_function() missing 1 required positional argument: 'foo'

https://github.com/python/mypy/issues/11753

Start by running the supplied mypy-play TypedDict and function-unpacking reproducer and compare mypy's diagnostic with Python's TypeError. Trace the handling of **a calls and TypedDict keys, then add coverage showing that the missing argument is foo rather than bar.