Turns out my WordPress update didn’t go nearly as well as I thought. Pretty much none of the posts that I had made since the update were showing up as they were stuck in the Unpublished Category. So I restored from my pre-upgrade backup and re-did the upgrade process. Worked like a charm this time and is clearly moving items out of Unpublished as it should, so things should be back to normal. I am now tracking down the missing posts and republishing them. Sorry for the inconvenience.