In one of my project i'm using NPM Bull.

Here is example.

const queue = new Queue(`job@@prepare-tasks`);  
const MAX_TASKS_FETCH = 100

const chunkCounts = Math.ceil(tasksJob.itemCounts / MAX_TASKS_FETCH);
    
for(let i = 0; i < chunkCounts; i++) {
  const tasksJobConfig: ITasksJob = clone(tasksJob);
  tasksJobConfig.offset = i * MAX_TASKS_FETCH;
  tasksJobConfig.limit = MAX_TASKS_FETCH;
  tasksJobConfig.isLast = chunkCounts === i + 1;
  queue.add(tasksJobConfig);
}

when I use special character @@ in the name ofn Queue as mentioned the above example. the execution of job is become random and when I remove the special character @@ then the job execute FIFO. as far they mentioned in the documentation by default the execution of job is FIFO . i debugged it but couldnt find out the reason.