same for me , IOS 15 & Monterey with Xcode 13 Beta 4 .

Thanks for your reply, it helped me to figure out the use of locale, it seems I had a problem understanding locale in String before. I used the new Formatter API ParseableFormatStyle and tried to let it be used to specify the text in the output by the following code let colorString = UIColorFormatStyle().mark().locale(Locale(identifier: "zh-cn")).format(UIColor.blue) Looks like I need to tweak the string handling a bit. https://www.fatbobman.com/posts/newFormatter/

After the previous explanation, I have no more questions about the current behavior of this method. locale is used here to interpolate values for strings as a guide. Since I've been hoping Apple would provide an API to get the localizedString for a specific locale, for now I can only try to get it via Bundle directly.

Does context.delete mean delete the NSManagedObject instance locally? So far, this method should indeed work. Still hope Apple will provide a better solution. So far, I haven't received any response from Apple.

func query(group: Group) { let id = group.id let predicate = #Predicate<Item> { item in item.group?.id == id // Compiles } } @MarcusAurelius This method can indeed compile, but when I use similar code to run, the following error message will appear: Thread 1: Fatal error: Couldn't find \Tag.id on Tag with fields May I ask if your code can use the above predicate to fetch data?