C414 is marked as unsafe fix, but only because of dropping comments: https://docs.astral.sh/ruff/rules/unnecessary-double-cast-or-process/#fix-safety

EDIT: I noticed now that C413 has an extensive warning about safety with regards to stable sorting https://docs.astral.sh/ruff/rules/unnecessary-call-around-sorted/#fix-safety - so the fix is perhaps just that it should be copied over?

But it also breaks sorting stability in some cases, autofixing sorted(reversed(iterable)) to sorted(iterable).

full shell command:

$ ruff check --select=C414 --fix --unsafe-fixes --isolated - <<< 'sorted(reversed(iterable))'  
sorted(iterable)
Found 1 error (1 fixed, 0 remaining).

ruff version: 0.3.0
platform: linux

And a full minimal example where the problem is demonstrated. Assertions pass before autofixing with ruff, but fail afterwards.

from __future__ import annotations
from dataclasses import dataclass
@dataclass
class MyClass:
    a: int
    b: int
    def __lt__(self, other: MyClass) -> bool:
        return self.a < other.a

first = MyClass(1, 1)
second = MyClass(1, 2)

# ruff will remove the reversed call in the line below, breaking the assertion
assert sorted(reversed((first, second))) == [second, first]
assert sorted((first, second)) == [first, second]

Found in the process of replacing some of sheds libcst code mods with ruff Zac-HD/shed#105
CodeMod in question: https://github.com/Zac-HD/shed/blob/692a429bff19c3e1a798b97cb45396160dc138eb/src/shed/_codemods.py#L275-L315

Unrelated to this specific issue: That codemod also handles cases of combining reverse:
sorted(sorted(iterable, reverse=True), reverse=False) -> sorted(iterable, reverse=False)
sorted(sorted(iterable, reverse=False), reverse=True) -> sorted(iterable, reverse=True)