This worked for me as well 👍.
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I'm having a similar issue but I've gone through all my screen shots for iPad and they all show the new screen shot. But when I view them in "View All Sizes in Media Manager" I can see that the 9.7 display size is showing the old screen shot. I only have the options of "12.9" and 12.9" iPad Pro (3rd Gen) and iPad Pro (2nd Gen) no option for "9.7" 😕