I resolved the issue by implementing a workaround, wherein I moved the update of the selection property to a separate thread, within the addItem method. DispatchQueue.main.asyncAfter(deadline: .now() ) { selection = newItem }

To complete I add also the part of the Details view that invoke the Editing `struct Details: View {     @Binding var d0:D0     @State private var data = D0.Data() ...                 Editing(data: $data) ...                             Button("Done") {                                 d0.update(from: data)                                 isPresentingEditView = false                             } ...

As a workaround, try keeping the canvas hidden while the project is building and the simulator is preparing. After many days of the same error, this works for me.