How to fix iOS 18 Dynamic Wallpaper Issue?

I have the new iOS 18 dynamic wallpaper set on my iPhone 15 Pro Max. I have the 'dynamic' option selected so it should change at various times of the day as per the description on device, have 'pair' selected for the home screen and have 'automatic' selected for appearance. However, only the lock screen ever changes colour or appearance, the home screen stays the same. The only way to change the home screen appearance is to select another wallpaper then change back to the new iOS 18 one which then applies to new colour and shade to the home screen. This has to be done every time the lock screen changes to get the home screen to match.

Has anyone else experienced this? I've removed and added the wallpaper several times, rebooted the phone etc and tried one of the fixed colours rather than dynamic and still get the same problem.

[Re-Titled By Moderator]