My gratitude. I provided feedback under the identifier FB16898056.

Instead of using UserDefaults to save the PersistentIdentifier, you might want to use AppStorage. https://developer.apple.com/documentation/swiftui/appstorage/init(_:store:)-9lku2 @Model class Recipe { ... } struct RecipeList: View { @Query var recipes: [Recipe] @AppStorage("selectedID") var selectedRecipeID: Recipe.ID? var body: some View { List(recipes, selection: $selectedRecipeID) { recipe in RecipeDetail(recipe) } } } or let selectedRecipeID = AppStorage<PersistentIdentifier?>("selectedID").wrappedValue

I also faced the same problem with this code. struct ContentView: View { @SectionedFetchRequest( sectionIdentifier: \Item.category!, sortDescriptors: [NSSortDescriptor(keyPath: \Item.name, ascending: true)], animation: .default) private var sections: SectionedFetchResults<String, Item> var body: some View { List { ForEach(sections) { section in Section(content: { ForEach(section) { item in Text(item.name!) } }, header: { Text(section.id) }) } } } } ↓ SOLUTION: add SortDescriptor         sortDescriptors: [NSSortDescriptor(keyPath: \Item.category, ascending: true),                           NSSortDescriptor(keyPath: \Item.name, ascending: true)], I don't know why, but adding a SortDescriptor for the category to the beginning of the array worked fine. I hope it helps. ADD: It is written in the document. Be sure that you choose sorting and sectioning that work together to avoid discontiguous sections. https://developer.apple.com/documentation/swiftui/sectionedfetchrequest