[Bug] Using `filter` in `itertools.chain` makes them both infer wrong types.

Repro:

import itertools
from typing import List

x: List[int] = [1, 2, 3]
y: List[str] = ["  ", "", "abc"]


it = itertools.chain(x, filter(lambda s: s.strip() == "", y))
reveal_type(it)

Actual output:

main.py:8: error: "object" has no attribute "strip"
main.py:9: note: Revealed type is 'itertools.chain[builtins.object*]'

Expected output:
I was expecting no errors and didn't expect filter to be affected by what it is put in, i.e. if you put filter call separate from itertools.chain, it prevents the first errors about missing strip attr:

f = filter(lambda s: s.strip() == "", y)
it = itertools.chain(x, f)
reveal_type(it)

The revealed type is still wrong though.

Python version: 3.7.6
Mypy version: 0.760 (still occurs on master)
Used flags: --strict

Start by reproducing the supplied example with mypy 0.760 or current master under --strict, comparing the inline and separate filter forms. The payload names no source files or tests; done means the inline form reports no missing strip attribute and reveals an appropriate chain element type rather than object.