I just encountered this question in the Close Votes review queue. Suppose I want to keep it open, but also correct the various grammar mistakes in the post. There's an Edit button for that (since I have enough reputation) ... but somebody else already did that in the form of a suggested edit. Having me duplicate the work of the editor would be a waste of time (and deprive the editor of their reputation, since their edit will be automatically rejected as an edit conflict). I remembered that I saw this question in the Suggested Edits review queue since I happened to review in that queue first, but I wouldn't have if I had visited the queues in a different order. Unlike the First Posts / Late Answers queues, there's no indication ('edit (1)') that there's a pending edit on the post:
I propose to show if there's a pending edit in the Edit button, like this:
Clicking the edit button could either show the suggested edit in a popup (like when reviewing one outside the review queues) or somehow navigate to that queue - you probably want to return to the Close / Reopen queue after reviewing the edit.
(FWIW I have voted to close the question outside the queue since it's an Expatriates rather than a Travel question. I just needed an example to show.)