iPhone 15 Pro - Can’t Change Default Wallpaper Style (Swipe Left/Right Not Working)

I recently noticed that I can’t change the style of the default iPhone 15 Pro wallpaper anymore. When I try to customize it:

1. I press and hold on the lock screen (while unlocked).
2. I select the default device wallpaper.
3. I try to swipe left or right to change the style/color variation—but nothing happens.

This used to work before, but now it seems broken. I’m running iOS 18.3, and I’ve tried restarting my phone, reapplying the wallpaper, and checking for updates.

Has anyone else experienced this? Any fixes? Or is this a new iOS bug?

Thanks!

P.S: I also couldn't find the default iPhone 15 Pro wallpaper in the collections when i try to reapply the wallpaper!