false positive no-any-return from a typed function nested in an untyped function

Bug Report

If an inner typed function which returns something other than None is nested within an untyped function then an error is generated about returning Any from the inner function.

To Reproduce

https://mypy-play.net/?mypy=latest&python=3.13&flags=warn-return-any&gist=469f5edd5d720344bf088f4c1294ad6e

Expected Behavior

bug.py:7: note: Revealed type is "pathlib.Path"
bug.py:15: note: Revealed type is "pathlib.Path"
bug.py:26: note: Revealed type is "pathlib.Path"
Success: no issues found in 1 source file

Actual Behavior

main.py:7: note: Revealed type is "pathlib.Path"
main.py:15: note: Revealed type is "pathlib.Path"
main.py:26: note: Revealed type is "Any"
main.py:27: error: Returning Any from function declared to return "str" [no-any-return]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used:1.19.1
• Mypy command-line flags: --warn-return-any
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.13

Comienza con la reproducción vinculada de mypy-play usando Python 3.13 y --warn-return-any; después, sigue cómo mypy gestiona una función interna tipada anidada en una función sin tipar. Se considera terminado cuando la función interna conserva su tipo de retorno pathlib.Path inferido y la reproducción no informa de ningún error no-any-return erróneo.