Worker doesn't find subsequent jobs?

[resting]

For instance, I've queued 10 jobs scheduled 1 minute ahead.

When I trigger the worker with bin/cake queue runworker,
This is the the output:

[2024-12-11 06:39:29] Looking for Job ...
Running Job of type "ApplyAddonsAfterActivation"
Job Finished.
---------------------------------------------------------------
[2024-12-11 06:39:29] Looking for Job ...
nothing to do, exiting.
Performing Old job cleanup.

Only one job was picked up and it exited without finding the next one successfully.

Here's my app_queue.php

return [
  'Queue' => [
    'sleeptime' => 5,
    'workertimeout' => 300, // 5 minutes timeout for worker
    'workermaxruntime' => 300, // 5 minutes runtime for worker
    'maxworkers' => 3,
    'exitwhennothingtodo' => true,
    'cleanuptimeout' => 86400, // remove completed jobs older than 1 day
  ]
];

I'm expecting the worker to pick up the next job after sleeping for 5 sec, and repeat the same process for all the outstanding jobs.

Please correct if my understanding is wrong.

Update:
I tried adding a sleep(3) to my Task, and it starts picking up the subsequent jobs. Not quite sure what's the logic here. Did it complete too fast? Was just logging text output for testing.

On v4.4.1