We have an issue with wallpapers. Some devices set defined background-images, others don't. The devices are in the same group. The behavior is inconsistent.
Any ideas, why this may happen?
When this happens to me, I add a space after the %Name% that pushes to the iPad's lock-screen, save it, then strip the space, save it again. Then for good measure re-push to missing. This usually gets the job done. Or possibly make sure you don't have some iPads in 2 different wallpaper groups. I've seen and done it all over the years! 🙂