Hmm… I switched themes and turned off all the other plugins, but it didn’t show up. However, I created a “test” page https://matthewwimer.com/test/ with only that, and it showed up. So something about the way that original theme treated that page gave it problems.
Thanks for your help! I’ll remember going about testing that next time.
I’m having a similar issue (I think). I have a few comments pulled in through social that show up under the Dashboard comments. I currently have “Disable Social’s comment display” checked so I can use the standard appearance of my theme (Divi). However, those comments aren’t appearing on the post.