BullMQ throwing "Missing lock for job <jobId> failed" after using moveToDelayed

Question

I'm following this pattern in the docs https://docs.bullmq.io/patterns/process-step-jobs

But it seems like the example code throws a Missing lock for job <jobId> failed error. Following is a minimal reproducible version

import { Worker, Queue } from "bullmq";

const sleep = (ms: number) => new Promise((r) => setTimeout(r, ms));

enum Step {
  Initial,
  Second,
  Finish,
}

type JobData = {
  step: Step;
};

const worker = new Worker<JobData>("reproduce-error", async (job, token) => {
  let step = job.data.step;
  while (step !== Step.Finish) {
    switch (step) {
      case Step.Initial: {
        await sleep(3 * 1000);
        await job.moveToDelayed(Date.now() + 1000, token);
        await job.update({
          step: Step.Second,
        });
        await job.updateProgress(1);
        step = Step.Second;
        break;
      }
      case Step.Second: {
        await sleep(3 * 1000);
        await job.update({
          step: Step.Finish,
        });
        await job.updateProgress(2);
        step = Step.Finish;
        return Step.Finish;
      }
      default: {
        throw new Error("invalid step");
      }
    }
  }
});

worker.on("error", (failedReason) => console.log(failedReason));

worker.on("progress", (job, progress) =>
  console.log("progress", job.data, progress)
);

const queue = new Queue<JobData>("reproduce-error");
queue.add("Reproduce error", { step: Step.Initial });

Here's a stack trace of the error

    at Scripts.finishedErrors (/Users/sumit/Coding/indiemaker/twips/reproduce-bullmq-error/node_modules/bullmq/src/classes/scripts.ts:356:16)
    at Job.moveToFailed (/Users/sumit/Coding/indiemaker/twips/reproduce-bullmq-error/node_modules/bullmq/src/classes/job.ts:618:26)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async handleFailed (/Users/sumit/Coding/indiemaker/twips/reproduce-bullmq-error/node_modules/bullmq/src/classes/worker.ts:642:11)
    at async Worker.retryIfFailed (/Users/sumit/Coding/indiemaker/twips/reproduce-bullmq-error/node_modules/bullmq/src/classes/worker.ts:788:16)
    at async Worker.run (/Users/sumit/Coding/indiemaker/twips/reproduce-bullmq-error/node_modules/bullmq/src/classes/worker.ts:385:34)

Here's what I've thought so far:

I suspect moveToDelayed moves the job to the delayed set but it keeps running the current execution. That's why it tries to move the same job to the delayed set twice and thus fails. But, changing the break to return in the Initial block should change that, but even that doesn't help and gives the same error. So there might be something more fundamental that's going wrong here.

Any help would be appreciated. Thanks in advance!