Nested Fragment subscriptions across different related Models not working

1

I’m not sure if this is a bug or if it is not supported.

I have a query a bit like

subscription TripListApollo($filter: TripSubscriptionFilter!) {
  Trip(filter: $filter) {
    mutation
    node {
      ...MutableTripDetails
    }
  }
}


fragment MutableTripDetails on Trip @apollo_client_ios_localCacheMutation {
  id
  name
  archived
  references(filter: { parentId: { is_empty: true } }) {
    items {
      ...ItineraryReference
    }
  }
  images {
    id
    downloadUrl
    provider
    fileId
    filename
  }
  owner {
    ...UserDetails
  }
}

fragment ItineraryReference on Reference @apollo_client_ios_localCacheMutation {
  id
  parent {
    id
  }
  visible
  nodeId
  parentId
  tripId
  viewDetails {
    items {
      ...ItineraryDetails
    }
  }
}

fragment ItineraryDetails on ViewDetail @apollo_client_ios_localCacheMutation {
  id
  name
  reference {
    tripId
  }
}

I have a watch query that also fetches the same fragments, and it works nicely, and when name in the Trip at the root changes, the subscription fires, however when I change the Details at the leaf of the tree, nothing happens.