@DTS Engineer this is still an issue in iOS 26 when sorting on a property of an optional relationship. @Query(sort: \Item.info?.endDate, order: .reverse) private var items: [Item] @Model final class Item { var info: ItemInfo? init(info: ItemInfo) { self.info = info } } @Model final class ItemInfo { var endDate: Date init(endDate: Date) { self.endDate = endDate } } SwiftData/DataUtilities.swift:85: Fatal error: Couldn't find \Item.<computed 0x000000010295573c (Optional<ItemInfo>)>?.<computed 0x0000000102955744 (Date)>? on Item with fields [SwiftData.Schema.PropertyMetadata(name: "info", keypath: \Item.<computed 0x0000000102954c58 (Optional<ItemInfo>)>, defaultValue: nil, metadata: nil)] iOS Simulator 26.0 beta 4 (23A5297i) Xcode Version 26.0 beta 4 (17A5285i) I made a minimal fork of the project @Atletismo343 provided: https://github.com/coughski/swiftdata-crash

@DTS Engineer the issue @Ches Beiner brought up is still an issue, as detailed in my post on the thread you linked to: SwiftData crash when using a @Query sort descriptor with a relationship

Thanks @DTS Engineer , I've submitted FB19648894 with the above sample project attached.