After investigation I figured out that this behaviour is impossible with AppIntents framework. To achieve it need to use INSendMessageIntent..
shalex9154
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Got the same issue with watch series 1 =( Hard reset not helped me at all.
If you use core data as Database, you can create a separate class with NSFetchResultController that will handle data updates. Then in ViewControllerB you will subscribe to FetchResult notifications and reload data when it available.