I don’t know if this has ever happened to you, but I recently realized I left out a word in subtitle of an article I was REALLY excited to publish and thought would so very well. I went back to edit the word in, and hoped no one noticed. Well, once you would click on the article again you would see the new, correct title, but it didn’t fix the thumbnail preview! To this day I go back and look and it still has the word missing until you actually pull up the article. So frustrating!