Motivated by this similar question, I've noticed a lot of edits being approved when they simply shouldn't be - in particular, for questions that are already on-hold. I've noticed this several times going through the Reopen Queue already, with questions like this one and this one.
In both cases, this was because a trivial edit was approved for each (ref, ref on that question after the question was put on hold. So in addition to the hundreds of valid questions in the queue which do need attention, this question was placed back into the queue twice after it was already put on-hold (so this one question has now been through the review queue a total of three times).
Do you think it would be worth-while to display a warning (similar to when posts are detected as possibly being spam), when approving suggested edits, for questions that are on-hold? (and emphasize to only approve non-trivial edits which might have the question actually be re-opened)