SL 360 sometimes does not find an existing item to republish in Review 360

I'm also seeing this issue for the first time today. I routinely do a Save As on a file after I publish, so that I can keep working and have the storyline that generated the review link preserved. I've been using this workflow for 5 years and this week is the first time where only ONE of my review links doesn't show in the dropdown to update. I really need to move the comments forward and do not want to have to copy and paste other people's comments into a new link.