Problem unerstanding redis+celery priotity management

[v-retoux]

From what I get reading this doc https://docs.celeryq.dev/en/stable/userguide/routing.html#redis-message-priorities It sounds like using 4 different priorities (0,1,2,3) I should be able to listen in queue (celery,celery:0,celery:1,celery2) with this configuration:

broker_transport_options: {
    'master_name': 'mymaster',
    'priority_steps': [0, 1, 2, 3],
    'queue_order_strategy': 'priority',
    'sep': ':',
    'visibility_timeout': 3600}
result_backend_transport_options: {
 'master_name': 'mymaster', 'visibility_timeout': 3600}
celery_broker_transport_options: {
    'master_name': 'mymaster',
    'priority_steps': [0, 1, 2, 3],
    'queue_order_strategy': 'priority',
    'sep': ':',
    'visibility_timeout': 3600}
celery_result_backend_transport_options: {
 'master_name': 'mymaster', 'visibility_timeout': 3600}

However when I try to launch a worker listening only on queue celery:1 for example I get nothing. I realized later that all task are going to celery queue. If I print celery_app.current_task.request.delivery_info in the worker I can see they all are using right priority but routing_key is always celery never celery:2 for example. Here is an example of what I got:

{'exchange': '', 'routing_key': 'celery', 'priority': 1, 'redelivered': True}

Am I missing something?