The pantalaimon build seems entirely broken due to some tests failing.

$ NIXPKGS_ALLOW_INSECURE=1 nix shell --impure '.#pantalaimon'
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: builder for '/nix/store/53f7n472hy99gsp83i040wbwf12pf190-pantalaimon-0.10.5.drv' failed with exit code 1;
       last 25 log lines:
       > /build/source/tests/pan_client_test.py:27
       > =============================== warnings summary ===============================
       > tests/proxy_test.py::TestClass::test_daemon_start
       > tests/proxy_test.py::TestClass::test_pan_client_sync
       > tests/proxy_test.py::TestClass::test_pan_client_keys_upload
       > tests/proxy_test.py::TestClass::test_server_users_update
       > tests/proxy_test.py::TestClass::tests_server_devices_update
       > tests/store_test.py::TestClass::test_new_indexstore
       >   /nix/store/vl9d79x9b9qyrihimavaaz8g5yla16d2-python3.12-pytest-8.3.4/lib/python3.12/site-packages/_pytest/python.py:148: PytestUnhandledCoroutineWarning: async def functions are not natively supported and have been skipped.
       >   You need to install a suitable plugin for your async framework, for example:
       >     - anyio
       >     - pytest-asyncio
       >     - pytest-tornasync
       >     - pytest-trio
       >     - pytest-twisted
       >     warnings.warn(PytestUnhandledCoroutineWarning(msg.format(nodeid)))
       >
       > -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
       > =========================== short test summary info ============================
       > ERROR tests/pan_client_test.py::TestClass::test_login
       > ERROR tests/pan_client_test.py::TestClass::test_start_loop
       > ERROR tests/pan_client_test.py::TestClass::test_history_fetching_tasks
       > ERROR tests/pan_client_test.py::TestClass::test_history_fetching_resume
       > ERROR tests/pan_client_test.py::TestClass::test_room_key_on_client_sync_stream
       > ============== 6 passed, 6 skipped, 6 warnings, 5 errors in 0.36s ==============
       For full logs, run 'nix log /nix/store/53f7n472hy99gsp83i040wbwf12pf190-pantalaimon-0.10.5.drv'.

It appears that the async tests are not working properly. How was this not detected before, and does anyone know how Python packaging works well enough to go fix it?

I've tried, but I couldn't figure out how to fix the issue.