AllThatIsLeftToUsIsHonor with NSAsynchronousFetchRequest

Hi!

I have the "-com.apple.CoreData.ConcurrencyDebug 1" argument set in the schema to check if I have some CoreData concurrency problems.

I don't know why but this code give me an Multithreading_Violation_AllThatIsLeftToUsIsHonor error.

Do you think I did something wrong with this code?

private func loadSigns(searchTerm: String) {
        let privateMOC = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
        privateMOC.parent = managedObjectContext
        let fetchRequest: NSFetchRequest = Sign.fetchRequest()
        
        let predicate = NSPredicate(format: "name CONTAINS[cd] %@", searchTerm, 0)
        fetchRequest.predicate = predicate
        
        let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
        fetchRequest.sortDescriptors = [sortDescriptor]
        
        let asynchronousFetchRequest = NSAsynchronousFetchRequest(fetchRequest: fetchRequest) {(result:NSAsynchronousFetchResult!) -> Void in
            print("request done")
        }
        
        do {
            _ = try privateMOC.execute(asynchronousFetchRequest) as? NSPersistentStoreAsynchronousResult
        } catch {
            let nserror = error as NSError
            fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
        }
    }

I also tried to incapsulate the code inside the perform method of the privateMOC but I still have the Multithreading_Violation_AllThatIsLeftToUsIsHonor error:

private func loadSigns(searchTerm: String) {
        let privateMOC = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
        privateMOC.parent = managedObjectContext
        privateMOC.perform {
            let fetchRequest: NSFetchRequest = Sign.fetchRequest()
            
            let predicate = NSPredicate(format: "name CONTAINS[cd] %@", searchTerm, 0)
            fetchRequest.predicate = predicate
            
            let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)
            fetchRequest.sortDescriptors = [sortDescriptor]
            
            let asynchronousFetchRequest = NSAsynchronousFetchRequest(fetchRequest: fetchRequest) {(result:NSAsynchronousFetchResult!) -> Void in
                print("request done")
            }
            
            do {
                _ = try privateMOC.execute(asynchronousFetchRequest) as? NSPersistentStoreAsynchronousResult
            } catch {
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }

Any idea?

Thank you