Strange error. pytest + nats.py

conftest.py

from typing import AsyncGenerator, Generator

import nats
import pytest
import pytest_asyncio
from testcontainers.nats import NatsContainer



@pytest.fixture(name="nats_container", scope="session")
def create_nats_container() -> Generator[NatsContainer, None, None]:
    with NatsContainer() as nats_container:
        yield nats_container


@pytest_asyncio.fixture(name="nats_conn", scope="session")
async def connect_nats(
    nats_container: NatsContainer,
) -> AsyncGenerator[nats.NATS, None]:
    conn_url = nats_container.nats_uri()
    nats_conn = await nats.connect(conn_url)
    yield nats_conn
    await nats_conn.close()

requirements.txt

nats-py==2.7.2
testcontainers==4.4.0
pytest==8.2.0
pytest-asyncio==0.23.6

test_simple.py

from nats import NATS
import pytest


@pytest.mark.asyncio
async def test_simple(nats_conn: NATS):
    sub = await nats_conn.subscribe("test")
    await nats_conn.publish("test", b"hello world")
    # Raise error
    await sub.next_msg(timeout=5.0)