NSManagedObjectContextDidSave has old data

My app uses CoreData to locally cache data from other services (3rd party, CloudKit). To simplify the logic of when I send changes from the app back to the service I use a notification listening for `NSManagedObjectContextDidSave`.

```

NotificationCenter.default.addObserver(forName: .NSManagedObjectContextDidSave, object: nil, queue: nil) { [weak self] notification in

guard

let welf = self,

let userInfo = notification.userInfo,

let context = notification.object as? NSManagedObjectContext,

context.parent == nil

else { return }

if let shouldSync = context.userInfo["ShouldSync"] as? Bool, !shouldSync {

return

}

let syncContext = welf.coreDataStack.newPrivateContext()

syncContext.name = "SyncContext"

syncContext.perform {

syncContext.userInfo["ShouldSync"] = false

let inserted = welf.objectsForKey(NSInsertedObjectsKey, dictionary: userInfo as NSDictionary, context: syncContext)

let updated = welf.objectsForKey(NSUpdatedObjectsKey, dictionary: userInfo as NSDictionary, context: syncContext)

let deleted = welf.objectsForKey(NSDeletedObjectsKey, dictionary: userInfo as NSDictionary, context: syncContext)

welf.syncManager.store(inserted, updated: updated, deleted: deleted, context: syncContext)

}

}

```

I use `ShouldSync` user info to easily ignore trying to save the changes made by `syncManager.store` which flip flags on objects to mark them as up to date or not.

```

public func newPrivateContext() -> NSManagedObjectContext {

let newPrivateContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)

newPrivateContext.persistentStoreCoordinator = storeContainer.persistentStoreCoordinator

newPrivateContext.name = "New private context"

newPrivateContext.mergePolicy = NSMergePolicy(merge: .mergeByPropertyObjectTrumpMergePolicyType)

return newPrivateContext

}

```

This is the new context I create, simply so I can add the `ShouldSync` user info without changing the context I use throughout the app and UI.

Anyways, I'm seeing some weird behavior where I flip the sync flag `object.hasSynced = false` to start syncing and when I check the `userInfo` and the contexts `registeredObjects` in `NSManagedObjectContextDidSave` notification block I see `hasSynced = true`.

How can I debug / fix this? The only method that sets `hasSynced` to true is creating the objects from the server, and within `syncManager.store(...)` so I don't think this is a problem of setting it to false and then back to true.