I'm stuck at an error EXC_BREAKPOINT (code=1, subcode=0x1a8d69a38)that is thrown in a class during initialization. The class is defined as: @Model public final class Parent { @Attribute(.unique) public var uuid: UUID /// The date specification. @Relationship(.cascade) public var dateSpec: DateSpec /// The title. public var title: Title /// The subtitle. public var subTitle: Subtitle public init(uuid: UUID, dateSpec: DateSpec, title: Title, subTitle: Subtitle) { self.uuid = uuid self.dateSpec = dateSpec self.title = title self.subTitle = subTitle } } The error is thrown in the var dateSpec property at the return self.getValue(for: \.dateSpec) call of the @PersistedProperty macro. DateSpec is defined this way: @Model public final class DateSpec { @Attribute(.unique) public var uuid: UUID /// The type of the date specification (`.point` or `.range`). public var type: DateSpecType @Relationship(.cascade) public var point: DatePoint @Relationship(.cascade) public var range: DateRange public init(uuid: UUID, type: DateSpecType = .none, point: DatePoint = .init(), range: DateRange = .init()) { self.uuid = uuid self.type = type self.point = point self.range = range } } And DatePoint is defined so: @Model public final class DatePoint { @Attribute(.unique) public var uuid: UUID public var format: String public var date: Date? public init(uuid: UUID, format: String, date: Date? = nil) { self.uuid = uuid self.format = format self.date = date } } (DateRange accordingly). So, as far as I understood the sessions, this should work. Or did I miss something? -- Edit: When taking out DatePoint and DateRange from the model, and replacing the properties by .transient wrappers that get/set the respective properties directly in DateSpec, then the error disappears. So, is the problem the cascading of the relationships between Parent and DateSpec, and DateSpec and DatePoint/DateRange?