I have RabbitMQ installed via the env.php file in our Magento 2.4 store and its accessible via Rabbit Panel but, though it says connections "no connections" and for some reason it is not processing bulk tasks in Magento or it is processing some but it is very slow over days and so not sure what the issue is. We checked the CRON job as it is running with correct permission so all our consumers are started. It was working fine on php 7.3 but we are now on php 7.4 so maybe that is the problem?
If I check the cron.log I see:
The error / notification that we are getting in the CRON is 'no commands defined in the "queue:consumers" namespace'

I'm fairly sure this is something very minor an expert will pick up on very quickly to solve.