Steps to reproduce

Expected behaviour

Hover on referenced function, its actual signature pops up

Actual behaviour

Instead, decorator's signature was prompted, as in screenshot above

Configuration

Operating System: macOS 11.4
Version of Python, python-telegram-bot & dependencies: Python 3.6.9 (pyenv), PTB 13.6

I first reported this to pylance (microsoft/pylance-release#1470), and was pointed out that @log()'s annotation is to blame (microsoft/pylance-release#1470 (comment)):

... in func: Callable[..., RT] throws away parameter definition, and should use ParamSpec instead.

However, ParamSpec is pretty new (landed in Python 3.10) thus requires typing_extension package with older Python.