How to use Airbrake's pybrake Django integration?

Question

I'm trying to apply the Django integration steps described for pybrake, a Python exception notifier for Airbrake. The Django project contains several apps, one of which is called lucy_web. In my setttings, I've defined the AIRBRAKE setting like so:

AIRBRAKE = dict(
    project_id=os.getenv('AIRBRAKE_API_KEY'),
    project_key=os.getenv('AIRBRAKE_PROJECT_ID'),
    environment=os.getenv('AIRBRAKE_ENVIRONMENT', default='production'),
    root_directory=os.path.dirname(os.getcwd()))

The LOGGING setting is:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        }
    },
    'handlers': {
        'console': {
            'level': os.environ.get('LOG_LEVEL', 'ERROR'),
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
        },
        'airbrake': {
            'level': 'ERROR',
            'class': 'pybrake.LoggingHandler',
        }
    },
    'loggers': {
        'django.db.backends': {
            'level': os.environ.get('LOG_LEVEL', 'ERROR'),
            'handlers': ['console'],
        },
        'lucy_web': {
            'handlers': ['airbrake'],
            'level': 'ERROR',
            'propagate': True,
        }
    }
}

Note that I've replaced the key 'app' in the README by 'lucy_web', the name of one of the apps in the project.

Now, as I understand from Python's logging documentation (https://docs.python.org/3/library/logging.html), any Logger object with a name like 'lucy_web.foo.bar' should propagate to the 'lucy_web' logger and get handled by its handler, which is defined above to be the pybrake.LoggingHandler.

To test this, I tried the following test in lucy_web/tests/test_airbrake.py:

import os
import logging
import pybrake
from django.test import SimpleTestCase

logger = logging.getLogger(__name__)


class AirbrakeTest(SimpleTestCase):
    def test_1(self):
        notifier = pybrake.Notifier(
            project_id=os.getenv('AIRBRAKE_PROJECT_ID'),
            project_key=os.getenv('AIRBRAKE_PROJECT_KEY'),
            environment='production',
            root_directory=os.path.dirname(os.getcwd()))

        try:
            raise ValueError("Hello")
        except Exception as err:
            notifier.notify(err)

    def test_2(self):
        logger.error("Foobar")

The first test is a more 'verbose' approach in which a pybrake.Notifier is instantiated directly. This succeeds in sending an error to Airbrake, as seen from our Airbrake dashboard:

However, the second test, which relies on the logging integration, doesn't appear to send any notification to Airbrake. Is this not supposed to be how it is supposed to work?