SwiftData：非法try 在不同上下文中的对象之间建立关系

我有两个漂亮的模型，想为它们创建一些虚拟的预览数据，但我遇到了错误:

Illegal attempt to establish a relationship 'person' between objects in different contexts个

错误发生在以下位置:

@MainActor
let previewContainer: ModelContainer = {
    do {
        let container = try ModelContainer(
            for: Person.self, Item.self,
            configurations: ModelConfiguration(isStoredInMemoryOnly: true)
        )
        let person = Person.dummy()
        container.mainContext.insert(person)
        for i in 0 ..< 12 {
            let item = Item.dummy(i, person: person) //ERROR!
            container.mainContext.insert(item)
        }
        return container
    } catch {
        fatalError("Failed to create container \(error)")
    }
}()

I'm using Xcode 15 beta 8.你知道我做错了什么吗？

以下是我的模型以供参考:

项目模型

@Model
final class Item {
    var note: String
    var person: Person

    init(note: String, person: Person) {
        self.note = note
        self.person = person
    }
    
    static func dummy(_ index: Int, person: Person) -> Item {
        return Item(
            note: "Item number \(index)",
            person: person
        )
    }
}

人物模型

@Model
final class Person {
    var name: String
    @Relationship(
        deleteRule: .cascade, 
        inverse: \Item.person
    )
    var items: [Item] = []
    
    init(name: String, items: [Item] = []) {
        self.name = name
        self.items = [Item]
    }
    
    static func dummy() -> Person {
        return Person(
            name: "John Doe"
        )
    }
}