`func-returns-value` false positive for union type?

func-returns-value seems to have an allowance for functions which themselves return None -- but not for functions which return a union with None

Bug Report

def returns_none() -> None: ...

def also_returns_none() -> None:
    return returns_none()  # ok

def also_returns_none_sometimes() -> int | None:
    return returns_none()  # E: func-returns-value

To Reproduce

(see above)

Expected Behavior

(no errors)

Actual Behavior

$ mypy t.py
t.py:7: error: "returns_none" does not return a value (it only ever returns None)  [func-returns-value]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.16.1
• Mypy command-line flags: n/a
• Mypy configuration options from mypy.ini (and other config files): n/a
• Python version used: 3.12.3

Reproduce the report in t.py with Python 3.12.3 and run mypy t.py to confirm the diagnostic. Then trace the func-returns-value check for calls returning None versus int | None; done means the shown union-returning function produces no error while the existing diagnostic behavior remains correct.