Unable to attach listeners

Questions and Help
#1

I’m upgrading an app to Sanic V22.12.0 and the following listeners aren’t been attached anymore.
before_server_start
after_server_start
after_server_stop

The methods attached to these listeners are no longer been called, but I get no error.

I’m using the AppLoader object alongside a factory to create the app and serving with Sanic.serve.

def serve_application(port, interface, ssl_context,) -> None:
   
    app, loader = configure_app()
    app.register_listener(
        partial(load_agent_on_start, model_path, endpoints, remote_storage),
        "before_server_start",
    )

    app.register_listener(
        partial(load_agent_on_start, model_path, endpoints, remote_storage),
        "before_server_start",
    )    
    app.register_listener(close_resources, "after_server_stop")
    app.prepare(
        host=interface,
        port=port,
        ssl=ssl_context,
        backlog=int(os.environ.get(ENV_SANIC_BACKLOG, "100")),
        workers=1,
    )
    Sanic.serve(primary=app, app_loader=loader)

Any help is appreciated, thanks!