Black screen problem !

Hello all, i have a problem with my OS and would love if someone can help ? i have been using DeepinOS for over 3 years now, but i always had this problem of a black wallpaper (see the picture) Note : my wallpaper is not black but whatever i do the home screen is always black, but the lock screen displays the correct wallpaper as it should ! (you can my actual wallpaper in the app list image)

Home screen (Wallpaper not displayed!)

Window screen (with actual wallpaper)