(🐞) Bad error message when invoking an overload with a bad call

This sample produces two error messages, the second is completely valid, but the first makes no sense.

from typing import overload

@overload
def foo(a: list[int]): ...
@overload
def foo(a: list[object]): ...
def foo(a): ...

foo(dict[str, list[object]]()[1])
# Argument 1 to "foo" has incompatible type "list[object]"; expected "list[int]"
# Invalid index type "int" for "dict[str, list[object]]"; expected type "str"

playground

Start with the supplied overload and invalid-dictionary-index reproducer, using the linked mypy-play example to observe both diagnostics. Trace how the overload call and invalid index are reported, then verify that the first message is no longer misleading while the valid index-type error remains. Add or update a regression test if the relevant test location is identified during investigation.