iCloud核心数据未同步第二台设备上的所有记录

When I create a sqlite core data store in iCloud and seed on one device, it works fine and has around 6,000 records. When I create the store on the second device, it syncs, but only ends up with around 4,000 records (presumably from the transaction logs). My sync code in response to NSPersistentStoreDidImportUbiquitousContentChangesNotification reads...When I create a sqlite core data store in iClou