RuntimeError: Event loop is closed, after first pytest with pytest.mark.anyio

Hi, I am trying to implement pytests using anyio. It works for the very first test but after that I get an error saying Event loop is closed. How can I fix that?

import pytest
from httpx import AsyncClient

from wolf.my_namespace.my_package.main import create_app

@pytest.fixture
def anyio_backend() -> str:
    return "asyncio"

client = AsyncClient(app=create_app(), base_url="http://test")


@pytest.mark.anyio
async def test_index() -> None:
    response = await client.get("/")
    assert response.status_code == 200
    assert response.json() == {"hello": "wolf"}


@pytest.mark.anyio
async def test_health() -> None:
    response = await client.get("/health/db")
    assert response.status_code in [200, 503]