[Python] Why don't I see any Celery task result keys in Redis (even though tasks succeed)?

I'm trying to run a basic Celery app with Redis as both the broker and the result backend. Everything works correctly—tasks are received, executed, and return the correct results—but I can't see any task-related keys in Redis. I'm using Redis Commander to inspect keys and also tried checking the keys from CLI inside the container.

tasks.py

from celery import Celery
from time import sleep

app = Celery("tasks", broker="redis://localhost:6379", backend="redis://localhost:6379")
app.conf.result_expires = 3600 # 1 hour result retention

@app.task
def process(x, y):
for _ in range(5):
sleep(10)
print("Processing")
return x**2 + y**2


docker-compose.yml

services:
redis:
image: redis
ports:
- "6379:6379"
redis-commander:
image: rediscommander/redis-commander
ports:
- "8081:8081"
environment:
- REDIS_HOSTS=local:redis:6379


How I run celery worker

celery -A tasks worker --loglevel=info -E

Result of the worker

-------------- celery@Parvizs-MacBook-Air.local v5.5.3 (immunity)
--- ***** -----
-- ******* ---- macOS-14.6.1-arm64-arm-64bit-Mach-O 2025-07-23
- *** --- * ---
- ** ---------- [config]
- ** ---------- .> app: tasks:0x10305c830
- ** ---------- .> transport: redis://localhost:6379//
- ** ---------- .> results: redis://localhost:6379/
- *** --- * --- .> concurrency: 8 (prefork)
-- ******* ---- .> task events: ON
--- ***** -----
-------------- [queues]
.> celery exchange=celery(direct) key=celery


Running the task in shell


process.delay(12, 12)


Celery logs

Task tasks.process[89899d0a-cb18-4ed7-8d9c-e8a442e9eb21] received
Processing
Processing
Processing
Processing
Processing
Task tasks.process[89899d0a-cb18-4ed7-8d9c-e8a442e9eb21] succeeded in 50.07s: 288


Can retrieve tasks from shell like this

result = process.AsyncResult("89899d0a-cb18-4ed7-8d9c-e8a442e9eb21")
result.get() # returns 288


And here is how I check my keys inside the redis container

docker exec -it <container_id> redis-cli
127.0.0.1:6379> SELECT 0
127.0.0.1:6379> KEYS *
(empty list)


I have checked databases from 0 to 15, the result is the same.

Is redis working properly ? If so, why am I not able to see the celery keys.

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