Currently, there is no guarantee that range deletions will continue to process the same range after step up that was being processed before step down. This causes a problem for tracking orphaned documents because if an update to the orphan count is missed due to a step down, the document could be processed after all other range deletions, potentially leaving a stale orphan count for a very long time.
To fix this, we should ensure that the same range deletion document that was being processed on step down is also processed on step up. This way an inaccurate orphan count will be fixed quickly.