Not sure why you have been downvoted. I have come to the same conclusions as you after using multiple options to debug (main thread checker + thread performance checker + Hardware Memory Tagging). I updated my own report through feedback to include reference to this.

Claude, I know it is not the dequeue statement because it dequeues and returns an object. I've verified in multiple places that the object IS valid. viewForSupplementaryElementOfKind works on initial loading and if we reload via other means.