This is explained in the core ticket #12554.
Change label in UI for Post Thumbnail and Page Image to “Featured Image” for both
We should change the UI label for the post thumbnail box on post and page editor screens. It’s post thumbnail for posts, and page image for pages, but it’s not always a thumbnail and the labeling is inconsistent. Let’s call it Featured Image for both, which is consistent and removes the size implication of the ‘thumbnail’ label.
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