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Only the first user class is being spawned when running locust as library

See original GitHub issue

Describe the bug

I’m running Locust as a library, when instantiating the environment, only the first user class gets spawn up

Expected behavior

All user classes should be span up with the right amount of stimulated users

Actual behavior

only the first specified used class in the environment is being spawned

Steps to reproduce

please see the code snippet

Environment

OS: MacOS
Python version: 3.7
Locust version: image “1.2.3”
Locust command line that you ran: running locust as a library in a main method
Locust file contents (anonymized if necessary):

user class A

class AUsers(HttpUser):
    host = os.environ.get("A_HOST")
    wait_time = constant_pacing(1)
    tasks = [ATask]

User class B

class BUser(HttpUser):
    host = os.environ.get("B_HOST")
    wait_time = constant_pacing(1)
    tasks = [Btasks]

Master main module :

    env = Environment(user_classes=[BUser,AUser])

    def run_manager(self):
        logging.info('*******************')
        logging.info('{}'.format("Starting Manager"))
        logging.info('*******************')
        self.env.step_load = True
        self.env.create_master_runner()
        self.env.create_web_ui("0.0.0.0", 8089)
        gevent.spawn(stats.stats_history, self.env.runner)
        self.env.runner.greenlet.join()

if __name__ == "__main__":
    manager = ManagerEnv()
    manager.run_manager()

Worker main module

    env = Environment(user_classes=[BUser,AUser])

    def run_worker(self):
        logging.info('*******************')
        logging.info('{}'.format("Starting Worker"))
        logging.info('*******************')
        self.env.create_worker_runner(os.environ.get('MANAGER_HOST'), 5557)
        gevent.spawn(stats_printer(self.env.stats))
        self.env.runner.greenlet.join()


if __name__ == "__main__":
    worker = Worker()
    worker.run_worker()

logs : /INFO/locust.runners: All users spawned: BUser: 1, AUser: 0 (4 already running)