Some Google Pixel Launcher users have found that various icons of installed apps are randomly no longer displayed.
Some users with Pixel smartphones report a strange error that sometimes does not show the application icons on the home screen. Those affected are users who trust Google’s pre-installed Pixel Launcher. At random and at will, Pixel Launcher no longer shows the corresponding icon for all applications. Screenshots of affected users support these allegations. Once the Sync app icon is missing, another time the Play Store suddenly no longer has its own icon.
Pixel Launcher no longer has all the icons on the home screen
However, this is only a visual aspect, because the source of the application icons is still there and the icon that cannot be seen can still be selected to launch an application. The error occurs even with the latest Pixel models and the latest Android 10 December software. So it seems to be a bigger problem with the Pixel Launcher app that will surely go away soon.