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Icons on home screen "fade in" after exiting an app or going to home screen, after Android 10 update. I cant' swear but I'm pretty sure that the icons appeared instantly before. I could not find an option anywhere (or within developer settings) to disable that effect. Makes phone seem slower and indeed I have to wait a split second for the icon to appear when going back to home screen.
Try changing your theme... I downloaded the dark theme now everything shows up great. I was going to try changing my wallpaper and in developer settings turned off all animations but the theme changed worked