It's not a very bug or issue, but i would like to report it.
As explained in tutorial:
The file name should be icon-store-1024.png (all lowercase) and its size should be 1024x1024.
This create a set of icon png with tranparence. When i tried to send the application on store, i got this error
ERROR ITMS-90717: "Invalid App Store Icon. The App Store Icon in the asset catalog in 'Some.app' can't be transparent nor contain an alpha channel."
I solved the error by saving the icon in jpg (with no Alpha channel so) and putting the new icon in project (using xcode)