[Bug]: Stale job ids remain on group list after job hash deleted

[ayush-goyal]

Version

7.38.2-alpha.2 (pro)

Platform

NodeJS

What happened?

We observed job ids still present on a BullMQ Pro group wait list (bull:<queue>:groups:<groupId> as a Redis LIST) while the corresponding job hash keys bull:<queue>:<jobId> no longer exists

We noticed this when a group was stuck and not draining, while other groups on the same queue keep processing. This seems to be the inverse of #3853.

Queue settings

{
  group: { concurrency: 1 },
  removeOnComplete: { age: 3600, count: 1000 },
  removeOnFail: { age: 24 * 3600 * 4, count: 100_000 },
}

Job settings

opts: {
  group: { id: `[id here]` },
  delay: 30_000,
  attempts: 3,
  backoff: { type: 'exponential', delay: 5000 },
}

How to reproduce.

We don’t have a minimal standalone repro yet

Relevant log output

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[manast]

Do you have any code that reproduces this issue?