It is not a bug. You are describing what I believe is the intended behavior. By selecting Elements 15 in the startup of the Home Screen, you are letting the program know what new features (since your last purchase) should be highlighted in the Tutorials available in the carousel at the top of the Home Screen.
And what you are seeing in Add Media box is one of the new features since Elements 15 - Autocreations.
But if you want to complain to Adobe about it, you can use the feedback form here.
. . . and I have quickly looked for what I believe you may have seen earlier on the Adobe US site but I cannot find it. It may have been removed. However, I found this page on the Maltese website. I think it is the comparison you may have seen (for Elements 2018 through 2021).