I download schema.json from server with apollo-tooling cli and give it to apollo cache with fragment matcher. That time server did not have CommentNotification type, just LikeNotification type which implements Notification interface.
I have notification components in react-native for LikeNotification type and Notification interface. I put a switch case which fallbacks unknown notifications which implements Notification interface to default notifications component.
My react-native app which is in app store right now has old version of schema.json and It dont know CommentNotification implements Notification interface and apollo client returns a empty object just with typename.