Sorting SwiftData objects

Using Swift
,
1

I am at day 85 of the HackingWithSwiftUI challenge and I just can't get the sorting of the Prospect objects to work. I even looked back to day 58 when Paul Hudson explained how to change the sorting parameters for the SwiftData query - but that didn't work.

Here's my Prospect object:

import Foundation
import SwiftData

@Model
class Prospect {
    var name: String
    var emailAddress: String
    var isContacted: Bool
    var dateAdded: Date = Date.now
    
    init(name: String, emailAddress: String, isContacted: Bool) {
        self.name = name
        self.emailAddress = emailAddress
        self.isContacted = isContacted
    }
}

I just added dateAdded when creating a new prospect.

In ProspectsView, where the query is shown, thise are the related code snippets:

@Query var prospects: [Prospect]

@State private var sortOrder = [
        SortDescriptor(\Prospect.dateAdded),
        SortDescriptor(\Prospect.name)
    ]

init(filter: FilterType) {
        self.filter = filter

        if filter != .none {
            let showContactedOnly = filter == .contacted

            _prospects = Query(filter: #Predicate {
                $0.isContacted == showContactedOnly
            }, sort: sortOrder)
        } else {
            _prospects = Query(sort: sortOrder)
        }
    }

This one is for selecting the sort order - but that works just fine:

Menu("Sort", systemImage: "arrow.up.arrow.down") {
    Picker("Sort", selection: $sortOrder) {
        Text("Sort by Name")
           .tag([
               SortDescriptor(\Prospect.name),
               SortDescriptor(\Prospect.dateAdded)
           ])
                          
        Text("Sort by Date added")
           .tag([
               SortDescriptor(\Prospect.dateAdded),
               SortDescriptor(\Prospect.name)
           ])
    }
}

The code compiles - it just doesn't do anything when changing the sort order.
Where is my error?