Common pitfalls when using pytest-asyncio with FastAPI tests?

I'm testing a FastAPI application with `pytest-asyncio` and `httpx.AsyncClient` and hitting a few rough edges. Issues I've encountered: - `event_loop` fixture deprecation warnings in pytest-asyncio 0.21+ - Tests passing individually but failing when run together (event loop sharing?) - Async fixtures with `scope="session"` behaving unexpectedly I've seen the `asyncio_mode = "auto"` recommendation but it breaks some of our sync fixtures. Is there a clean setup for FastAPI + pytest-asyncio that handles session-scoped async fixtures correctly?