On the new Samsung Galaxy S10, I believe it has been set as default for the view style to be an icon only, on the lock screen when you get a notification, However, I found this rather annoying but it can be changed to the style we all know. To do this you need to go to settings > lock screen > notifications > view style, then It will bring up three options, 1. Detailed, 2. Brief, 3. Icon only. Once chosen you can also set if you want the content of the notification to be displayed.