Fix potential item change in background thread

LeStorage/StoredCollection.swift

@@ -433,7 +433,9 @@ public class StoredCollection<T: Storable>: RandomAccessCollection, SomeCollecti
         Task {
             do {
                 if let result = try await self._store.sendInsertion(instance) {
-                    self._hasChanged = instance.copyFromServerInstance(result)
+                    DispatchQueue.main.async {
+                        self._hasChanged = instance.copyFromServerInstance(result)
+                    }
                 }
             } catch {
                 Logger.error(error)