White box instead of icon on iphone Xs

Hello,

I believe this could be related to your Home Screen layout in regard to Focus settings, since it mentions Sleep Focus.

Move apps and widgets on the Home Screen on iPhone - Apple Support

”Tip: You can move all your apps and widgets related to a particular Focus (your Work Focus, for example) onto one Home Screen page, and make that page accessible during that Focus.”

Another possibility is apps in the App Library rather than on your Home Screen.

Find your apps in App Library on iPhone - Apple Support

”When you download new apps from the App Store, you can add them to the Home Screen and App Library, or to App Library only.” This can happen automatically if Home Screen pages are hidden.

I hope this helps.

How to remove them?