We are running a Django app with built in connection pooling:

DATABASES["default"]["OPTIONS"] = {
    "pool": {
        "min_size": 1,
        "max_size": 20,
        "timeout": 20,
    }
}

And we were running celery with the threads pool:

celery \
    -A our_app \
    worker \
    --loglevel info \
    --concurrency 4 \
    --pool threads \
    --max-tasks-per-child=100

This worked until we upgraded to Celery 5.6 but then we started getting:

OperationalError
the pool 'pool-72' is closed

I believe this was due to this pr: #9953

If we switch to --pool prefork the issue goes away.

This looks like a regression to me and I think the pool should only be closed on prefork pool types. Thoughts?