I am trying to create a Multiplatform Document Based app using SwiftUI. I have a List which the user can reorder by dragging Items using .onMove. It works fine in macOS but crashes iOS every time with the above message alongside @main The relevant code is- struct ContentView: View { … List { ForEach(Array(document.journey.items.enumerated()), id: \.1.id) { (index, item) in Section { HStack { Text("\(index+1)") … Text("\(item.address)" … } // End HStack .background( Capsule() .fill((selection.contains(item.id) ? Color.red : Color.blue)) .onTapGesture(perform: { if selection.contains(item.id) { selection.remove(item.id) } else { selection.insert(item.id) } }) ) .font(.headline) .foregroundColor(.white) } // End Section … } // End ForEach .onDelete(perform: delete) .onMove { offsets, toOffset in document.moveItems(offsets: offsets, toOffset: toOffset, undoManager: undoManager) } } // End List //////// final class MultiStopDocument: ReferenceFileDocument { … func moveItems(offsets: IndexSet, toOffset: Int, undoManager: UndoManager? = nil) { let oldItems = journey.items // BREAK POINT print("GOT to First") withAnimation { journey.items.move(fromOffsets: offsets, toOffset: toOffset) } print("GOT to Second") #if os(macOS) undoManager?.registerUndo(withTarget: self) { doc in doc.replaceItems(with: oldItems, undoManager: undoManager) } #endif } /////////// import SwiftUI @main - Thread 1: EXC_BREAKPOINT (code=1, subcode=0x1af84999c) struct MultiStopApp: App { Console macOS stepping :- GOT to First GOT to Second Console iOS stepping :- 2023-06-07 12:03:16.869439+0100 MultiStop[27341:6172177] -[UITextEffectsWindow _accessibilityFindSubviewDescendant:]: unrecognized selector sent to instance 0x112037400 GOT to First 2023-06-07 12:03:52.083774+0100 MultiStop[27341:6172433] XPC connection interrupted GOT to Second THEN CRASH