https://developer.apple.com/design/human-interface-guidelines/foundations/app-icons
"On most platforms, the system applies a mask that automatically adjusts icon corners to match the platform’s aesthetic. For example, watchOS automatically applies a circular mask. The exception is macOS: Although the system applies the rounded rectangle appearance to the icon of an app created with Mac Catalyst, you need to create your macOS app icon in the correct shape."
jakub_a
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