Task in SwiftUI runs but view that is inside a sheet is not updated

I have a simple view that is using a class to generate a link for the user to share.

This link is generated asynchronously so is run by using the .task modifier.

class SomeClass : ObservableObject {

func getLinkURL() async -> URL {
    
    try? await Task.sleep(for: .seconds(1))
    return URL(string:"https://www.apple.com")!
  }
}

struct ContentView: View {

@State var showSheet = false
@State var link : URL?
@StateObject var someClass = SomeClass()

var body: some View {
    VStack {
        Button ("Show Sheet") {
            showSheet.toggle()
        }
    }
    .padding()
    .sheet(isPresented: $showSheet) {
        if let link = link {
            ShareLink(item: link)
        } else {
            HStack {
                ProgressView()
                Text("Generating Link")
            }
            
        }
    }.task {
        let link = await someClass.getLinkURL()
        print ("I got the link",link)
        await MainActor.run {
            self.link = link
        }
    }
    
   }
}

I've simplified my actual code to this example which still displays the same behavior. The task is properly executed when the view appears, and I see the debug print for the link. But when pressing the button to present the sheet the link is nil.

The workaround I found for this is to move the .task modifier to be inside the sheet, but that doesn't make sense to me nor do I understand why that works.

Is this a bug, or am I missing something?