Are you deploying your iOS app from a Home windows machine, not utilizing a Mac? In different phrases, are you utilizing Sizzling Restart?
If you’re, that’s the reason why. Underneath Limitations within the documentation on of the bullets says:
Asset catalogs aren’t supported. When utilizing Sizzling Restart, your app will present a .NET icon and launch display screen.
That is due to how Sizzling Restart works. Sizzling Restart makes use of a pre-built app container that shall be used to inject your .NET MAUI app in. However meaning at that time the icon and splash display screen can’t be modified anymore.
For those who would launch the app, the icon and splash display screen ought to present up high quality.