Windows spotlight image missing in the lock screen Dev.

You can try a few things because sometimes Windows Spotlight stops working due to sync or cache issues. First, go to Settings → Personalization → Lock Screen and check if Windows Spotlight is selected. If it is already selected, try switching it to Picture or Slideshow, restart your PC, and then switch it back to Windows Spotlight again. Another thing you can try is resetting the Spotlight cache. Sometimes corrupted cache files cause the images to stop appearing on the lock screen. Also make sure your internet connection is active, because Windows Spotlight downloads images from Microsoft servers. Some users have reported this issue recently, so it could also be a temporary bug in a Windows update.