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#1
I don't see any wallpaper. Can you post a before picture so I (we?) can see the difference.
All I can see out of the ordinary, besides no wallpaper, is 4 icons are selected (have a brownish background).
You don't have any wallpaper, you have a solid color.
Do you use a Dark Theme? If so, try changing it to something else, log off, log on then select the Dark Theme again.