[quote='789086022, DTS Engineer, /thread/756216?answerId=789086022#789086022']
The dock icon for your app is determined by the icon set up in your app, while the App Store icon is uploaded to the App Store. When you create a macOS app or any other app on the App Store, you must provide metadata for the app, including the App Store and screenshots.
[/quote]
To clarify this part. As far as I know, it is not possible to upload the App Store icon separately. It is actually a part of the icon set configured in the app in Xcode. There is one icon called "App Store - 2x" (1024x1024) for that. Here is the reference:
@DTS Engineer thank you for the clarification. However, I think that both the documentation and Apple Design Resources are missing information about the App Store icon.
I couldn't find any of the following information:
Specification for the App Store icon (besides the information that its size should be 1024x1024)
Whether the App Store icon should be rounded or rectangular
Whether the App Store icon should contain padding like the app icon or not
Template for the App Store icon
As I mentioned, there is only one template for macOS Sonoma icons, called "Production Templates" at https://developer.apple.com/design/resources
The official template is quite misleading because it has 1024x1024 version as presented here:
But as you can see in the first screenshot, there is only one icon 1024x1024 in the set and it is for the App Store only. So if you use the one from the template, you'll get the incorrect result as described in the main post.
I think the 1024x1024 icon should be removed from the template to avoid confusion between app icon & App Store icon.