SwiftData中使用Relationship(.cascade)时崩溃求助

我在从SwiftData模型对象中获取值时发生了崩溃，既没有向数据表插入任何数据，只是初始化了一个新对象，就尝试把它的默认值赋值给本地的@State变量。

相关模型代码：

@Model
final class CompanyDetail: Identifiable, CustomStringConvertible {
    
    @Attribute(.unique) var id = UUID()
    var name: String = ""
    var dateOfJoin: Date = Date.now
    var workingHours: String = ""
    var weeklyWorkingDays: String = ""
    
    init(id: UUID = UUID(), name: String, dateOfJoin: Date, workingHours: String, weeklyWorkingDays: String) {
        self.id = id
        self.name = name
        self.dateOfJoin = dateOfJoin
        self.workingHours = workingHours
        self.weeklyWorkingDays = weeklyWorkingDays
    }
    
    init() {}

    var description: String {
        String(format: "id: %@, name: %@, DoJ: %@, workingHours: %@, weeklyWorkingDays: %@", id.description, name, dateOfJoin.description, workingHours, weeklyWorkingDays)
    }
}

取值代码：

let myDetail = UserDetail()
        
        self.userName = myDetail.name
        self.dob = myDetail.dateOfBirth
        
        self.email = myDetail.email
        self.mobileNumber = myDetail.mobile
        
        if let company = myDetail.company {
            self.companyName = company.name
            self.joinedDate = company.dateOfJoin
            
            self.workingHours = company.workingHours
            self.workingDays = company.weeklyWorkingDays
        }

内容的提问来源于stack exchange，提问作者Kathiresan Murugan