How to debug a workflow stuck in "Waiting" state

Looking at the older logs, I see a bunch of these:

12/17/2023 03:16:05 AM <964422> kiwipy.rmq.tasks: [ERROR] Exception occurred while processing task.

But I don’t know if they correspond to the WorkChain in question. This was about the time where I was dealing with How to kill a monster workflow :japanese_ogre: