Celery does not see objects in SQLite (in Docker)

I have project on Django, DRF, SQLite, RabbitMQ and Celery.

When I run the project locally (separately rabbitmq, celery and django), everything works correctly. But when I run it in Docker, the task in celery does not find an object in the database. Attempts to find the created task from the celery container shell are also unsuccessful (I only see old objects). If I enable CELERY_TASK_ALWAYS_EAGER=True setting, then everything works fine in Docker.

settings.py

DATABASES = {"default": {"ENGINE": "django.db.backends.sqlite3","NAME": BASE_DIR / "db.sqlite3",    }}

docker-compose.yaml

version: "3.7"services:  rabbitmq:    restart: always    container_name: "rabbitmq"    image: rabbitmq:3-management-alpine    ports:      - 5672:5672      - 15672:15672  app:    restart: always    container_name: "fbrq_api"    build: .    volumes:      - .:/code    command: python3 manage.py runserver 0.0.0.0:8000    ports:      - "8000:8000"  celery:    restart: always    container_name: "celery"    build:      context: .    command: celery -A fbrq_api worker -l info    env_file:      - ./.env    depends_on:      - app      - rabbitmq    environment:      - CELERY_BROKER_URL=amqp://guest:guest@rabbitmq:5672/

celery.py

import osfrom celery import Celeryos.environ.setdefault("DJANGO_SETTINGS_MODULE", "fbrq_api.settings")app = Celery("fbrq_api", broker="amqp://guest:guest@rabbitmq:5672/")app.config_from_object("django.conf:settings", namespace="CELERY")app.autodiscover_tasks()@app.task(bind=True, ignore_result=True)def debug_task(self):    print(f"Request: {self.request!r}")

I understand that SQLite is not the best choice, but I think it's not about the database itself, but about the connection between Celery and the database.

UPDATE

An exception occurs here:

@shared_task(bind=True, acks_late=True)def send_mailing(self, mailing_id):    try:        mailing = Mailing.objects.get(id=mailing_id)        ...    except Mailing.DoesNotExist:        logger.warning(f"Mailing {mailing_id} doesn't exist")