fetchMore networkStatus and notifyOnNetworkChange not working in 3.3.7

In the latest version (3.3.7) the networkStatus for fetchingMore is not working:

export declare enum NetworkStatus {
    loading = 1,
    setVariables = 2,
    fetchMore = 3,
    refetch = 4,
    poll = 6,
    ready = 7,
    error = 8
}

But when calling fetchMore, the networkStatus is never changed to 3 when notifyOnNetworkChange = true....