As mentioned, the black and white app icons are not actually apps. They are each their own Shortcut bookmark which then launch into a specific app.
The icons I’m using are a set by desiger Traf that I purchased here. (Traf also just recently updated the icon set to include some additional colors and more app icons.)
The app icons are each an individual custom shortcut that I added to my Home Screen as a Shortcuts bookmark. Tapping the bookmark launches a Shortcut that launches the app I have specified. The detour through the Shortcuts app is certainly a bummer, but for now I’m dealing with it. 🤷♂️