Mac app, SwiftUI: Change Dock menu

Hello.

I'm trying to change my SwiftUI Mac app icon's menu in the Dock, using the NSApplicationDelegate's applicationDockMenu(_ : ) function.

However, it does not work: The delegate function is only called once, randomly after launch, and then never again, and it will not show any items in that menu I return. When I right-click the app in the Dock, only the macOS-supplied items are shown, and my App delegate function is not called.

Here's the code I use inside my NSApplicationDelegate:

func applicationDockMenu(_ sender: NSApplication) -> NSMenu? {
		let men = NSMenu()
		
		print("applicationDockMenu called")

		var it = NSMenuItem(title: "Test1", action: #selector(test(_:)), keyEquivalent: "")
		it.target = self
		men.addItem(it)
		it = NSMenuItem(title: "Test2", action: #selector(test(_:)), keyEquivalent: "")
		it.target = self
		men.addItem(it)
		
		return men
	}
	
	@objc func test(_ sender: NSMenuItem) {
		print("application dock menu custom item called")
	}

Is there a SwiftUI modifier I should be using instead of the NSApp delegate method, or is this just not supported at this time in SwiftUI Mac apps?

Thank you,

- Matthias