SwiftData one-to-many Relationship not working

Hello, I have the problem that my todos are not only assigned to one project (one-to-many). They are displayed in the same way in every project. What have I done wrong?

Die HauptApp:

import SwiftData

@main
struct consiliaApp: App {
    
   
    
    var body: some Scene {
        WindowGroup {
            ProjektView()
        }.modelContainer(for: Projekte.self)
    }
}

Das Datenmodell:

import SwiftData

@Model

final class Projekte {
    
    
    var name: String
    var info: String
    var startdate: Date
    var enddate: Date
    var startadresse: String
    var zieladresse: String
    var priority: Int
    
    @Relationship(deleteRule: .cascade, inverse: \Todo.projekte)
    var todos: [Todo]? = []
    
    init(name: String, info: String, startdate: Date, enddate: Date, startadresse: String, zieladresse: String, priority: Int) {
        self.name = name
        self.info = info
        self.startdate = startdate
        self.enddate = enddate
        self.startadresse = startadresse
        self.zieladresse = zieladresse
        self.priority = priority
       
    }
    
   
}

@Model
class Todo {
    
    var name: String
    
   
       // @Relationship
        var projekte: Projekte?
    
    init(name: String, projekte: Projekte) {
        self.name = name
        self.projekte = projekte

    }
}

So speichere ich die Projekte:

let newDaten = Projekte(name: name, info: info, startdate: stardate, enddate: enddate, startadresse: startadresse, zieladresse: zieladresse, priority: priority)
                modelContext.insert(newDaten)
                newDaten.todos = []

Das ist der TodoAddView:

import SwiftData

struct TodoAddView: View {
    @Environment(\.modelContext) private var modelContext
    @Environment(\.dismiss) var dismiss
    
 
    var projekte: Projekte
    
    @State private var name: String = ""
    
    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Name")) {
                    TextField("Name eingeben", text: $name)
                }
            }
            .navigationBarTitle("Aufgabe hinzufügen", displayMode: .inline)
            .navigationBarItems(leading: Button("Abbrechen"){
                dismiss()
            }.foregroundStyle(.red), trailing: Button("Fertig") {
                // Hier Code zum Speichern der Daten
               
                let newDaten = Todo(name: name, projekte: projekte)
                modelContext.insert(newDaten)
                newDaten.projekte = projekte
                projekte.todos?.append(newDaten)
                
                
                dismiss()
                    
            })
        }
    }
}

Thanks and a nice Weekend!