When the queue is left sitting for a few months, a significant portion of the suggestions results in "No edit was made". Often it's because the citation was removed or edited independently, sometimes it's people acting on the suggestion outside the tool (I run into one case or two by Josve05a).

This annoys users, as shown by T178979 and T180672, and is a problem for at least three reasons:

• some time is wasted looking at suggestions which are no longer relevant;
• instead of loading a new suggestion right away, the warning requires that you click the button again;
• stale suggestions inflate the queue, making it harder to tell how many "real" suggestions are left.