`--last-failed` does not (always?) see tests which failed in a subtest

When running a unittest-based test suite which makes use of subtests, failed subtests are correctly reported at the end of a run (possibly a bit too much as it's hitting #13905 / #13986), *however* when re-running tests using `--lf` they seem to skipped. Originally observed on pytest 9.0.2 / uv python 3.12, reproduced on 9.0.3 / uv python 3.14, running on linux mint 22.3 ```sh $ uv run pytest ==== test session starts === platform linux -- Python 3.14.2, pytest-9.0.3, pluggy-1.6.0 rootdir: /tmp/testdir configfile: pytest.ini collected 1 item test_qux.py . [100%] === FAILURES === __________________________________________________________________________________________________________ FooTest.testX (index=1) ___________________________________________________________________________________________________________ self = <test_qux.FooTest testMethod=testX> def testX(self): for i in range(5): with self.subTest(index=i): > self.assertEqual(i % 2, 0) E AssertionError: 1 != 0 test_qux.py:9: AssertionError __________________________________________________________________________________________________________ FooTest.testX (index=3) ___________________________________________________________________________________________________________ self = <test_qux.FooTest testMethod=testX> def testX(self): for i in range(5): with self.subTest(index=i): > self.assertEqual(i % 2, 0) E AssertionError: 1 != 0 test_qux.py:9: AssertionError ======================================================================================================= short test summary info === SUBFAILED(index=1) test_qux.py::FooTest::testX - AssertionError: 1 != 0 SUBFAILED(index=3) test_qux.py::FooTest::testX - AssertionError: 1 != 0 === 2 failed, 1 passed in 0.04s === $ uv run pytest --cache-show === test session starts === platform linux -- Python 3.14.2, pytest-9.0.3, pluggy-1.6.0 rootdir: /tmp/testdir configfile: pytest.ini cachedir: /tmp/testdir/.pytest_cache --- cache values for '*' --- cache/nodeids contains: ['test_qux.py::FooTest::testX'] === no tests ran in 0.00s === $ uv run pytest --lf --lfnf=none === test session starts === platform linux -- Python 3.14.2, pytest-9.0.3, pluggy-1.6.0 rootdir: /tmp/testdir configfile: pytest.ini collected 1 item / 1 deselected / 0 selected run-last-failure: no previously failed tests, deselecting all items. === 1 deselected in 0.00s === ``` ```python # test_qux.py import unittest class FooTest(unittest.TestCase): def testX(self): for i in range(5): with self.subTest(index=i): self.assertEqual(i % 2, 0) ``` ```toml # pyproject.toml (mostly so uv knows to fetch pytest) [project] name = "testdir" version = "0.1.0" description = "Add your description here" readme = "README.md" requires-python = ">=3.14" dependencies = [] [dependency-groups] dev = [ "pytest>=9.0.3", ] ``` And an empty pytest.ini to ensure pytest gets the correct rootdir (not sure it's necessary with the pyproject.toml but...)