It appears that this might be more insidious than I first guessed. If you follow the reproduction steps above and then do the following:
- Flag another post as “Something Else”
- Navigate to the moderator review queue
- Ensure that “Status” is “Pending”
- Ensure that “Order by” is set to “Priority”
- Click “Refresh”
Expected: Moderator queue entries be sorted in priority order
Actual: Moderator queue entries are sorted chronologically by time flagged (oldest to newest)
Additionally, “Priority (reverse)” sorts the entries chronologically by time flagged (newest to oldest).