Building an app, which worked fine until I updated to XCode 16. The app parses data and saves it to SwiftData, and later that store is used for filtering in data. If I create the store on iOS 18, the store created has issues with relationships, so filtering is not working (I hope that will be fixed in iOS 18.1), so I need to create the store on iOS 17.5. But before saving the parsed objects to the SwiftData (store), I do the checking for dupes. And after Xcode 16 update that is not working anymore on iOS 17.5, (but this part is working fine under iOS 18): Here is my object: import Foundation import SwiftData @Model class CaliberData: Identifiable { var id: UUID = UUID() var sizeHeights: [SizeObject] var featuresABCDIds: [Int] init( id: UUID, sizeHeights: [SizeObject], featuresABCDIds: [Int], ) { self.id = id self.sizeHeights = sizeHeights self.featuresABCDIds = featuresABCDIds } extension CaliberData: Equatable { static func == (lhs: CaliberData, rhs: CaliberData) -> Bool { lhs.featuresABCDIds == rhs.featuresABCDIds && lhs.sizeHeights == rhs.sizeHeights } } SizeObject if needed: @Model class SizeObject: Identifiable, Equatable { @Attribute(.unique) var id: Float @Relationship(inverse: \CaliberData.sizeHeights) private(set) var caliberDataSizesX: [CaliberData]? init(_ size: Float) { self.id = size } } When I am doing the caliberData1 == CaliberData2 comparison to remove dupes before inserting to the SwifData modelContext I am getting exception, and Xcode shows it inside getter part of this expanded section under sizeHeights definition: @storageRestrictions(accesses: _$backingData, initializes: _sizeHeights) init(initialValue) { _$backingData.setValue(forKey: \.sizeHeights, to: initialValue) _sizeHeights = _SwiftDataNoType() } get { _$observationRegistrar.access(self, keyPath: \.sizeHeights) return self.getValue(forKey: \.sizeHeights) } set { _$observationRegistrar.withMutation(of: self, keyPath: \.sizeHeights) { self.setValue(forKey: \.sizeHeights, to: newValue) } } } Following is the stacktrace: #1 0x00000001cc168928 in ___lldb_unnamed_symbol4385 () #2 0x00000001cc163f34 in ___lldb_unnamed_symbol4354 () #3 0x00000001cc165fc4 in ___lldb_unnamed_symbol4369 () #4 0x00000001cc169dd4 in ___lldb_unnamed_symbol4403 () #5 0x00000001cc123854 in SwiftData.PersistentModel.getValue<τ_0_0, τ_0_1 where τ_1_0: SwiftData.RelationshipCollection, τ_1_1 == τ_1_0.PersistentElement>(forKey: Swift.KeyPath<τ_0_0, τ_1_0>) -> τ_1_0 () #6 0x0000000105eda3b0 in CaliberData.sizeHeights.getter at /var/folders/5y/vv3v98ms7jj3z4kj0f3d6f9h0000gq/T/swift-generated-sources/@__swiftmacro_11CaliberDataC11sizeHeights18_PersistedPropertyfMa_.swift:9 #7 0x0000000105ef1a84 in static CaliberData.== infix(_:_:) at ... My assumption is that "it" thinks that object is already inside the modelContext, when it's actually not yet inserted there and should act like regular class (by regular, I mean - like not marked with @Model macro). How can I do objects comparison on iOS 17.5 with Xcode 16 (before they are inserted in modelContext)? Any other options?