`test_get_platform` hangs on x86_64-darwin when called via asyncify

[sarahec]

Building for nixpkgs on x86_64-darwin ("Intel MacOS"), encountered the following error:

============================= test session starts ==============================
platform darwin -- Python 3.13.5, pytest-8.3.5, pluggy-1.6.0
rootdir: /private/tmp/nix-build-python3.13-anthropic-0.59.0.drv-0/source
configfile: pyproject.toml
testpaths: tests
plugins: asyncio-0.26.0, xdist-3.6.1, respx-0.22.0, anyio-4.9.0
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope=session, asyncio_default_test_loop_scope=function
2 workers [398 items]  m
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F.....................................                                   [100%]
=================================== FAILURES ===================================
_____________________ TestAsyncAnthropic.test_get_platform _____________________
[gw1] darwin -- Python 3.13.5 /nix/store/9zzyv1p496m8b7j8v3y2dqq1xii9anx5-python3-3.13.5/bin/python3.13
tests/test_client.py:1870: in test_get_platform
    raise AssertionError("calling get_platform using asyncify resulted in a hung process")
E   AssertionError: calling get_platform using asyncify resulted in a hung process
=========================== short test summary info ============================
FAILED tests/test_client.py::TestAsyncAnthropic::test_get_platform - AssertionError: calling get_platform using asyncify resulted in a hung process
======================== 1 failed, 397 passed in 39.99s ========================

Please let me know if you need any info to track this down.