As articles / blog posts change featured images might change as well. As one shares the link on Facebook the article might show the old image and not the new. We need to tell Facebook to show the updated image. The process is called scraping (a kind of refresh). We can use the Facebook Sharing Debugger to update the link to show the correct image.
Here is an example from a Norwegian client site called debatt1.no.
I added the article link and clicked to debug. Initially the old image showed up first so I clicked the Scrape Again button to get the new image to show up. There is also additional information on this page to go through, but the most important part is getting the updated image in place.