Apollo-client: QueryResult.loading not updated when fetchMore is called from 3.0.0-beta.46

[dosatross]

loading variable of useQuery result remains false while fetchMore call is pending network request. I have notifyOnNetworkStatusChange: true in useQuery options.
This seems to have been introduced in 3.0.0-beta.46 as it does not occur in 3.0.0-beta.45

Intended outcome:
expect loading variable to be true after fetchMore is called

Actual outcome:
loading remains false after fetchMore is called

How to reproduce the issue:
query with useQuery and paginate with fetchMore
notice loading remains false after fetchMore is called
revert back to version 3.0.0-beta.45 and do the same
notice loading is true after fetchMore is called

Versions
System:
OS: macOS Sierra 10.12.6
Binaries:
Node: 13.1.0 - /usr/local/bin/node
Yarn: 1.19.1 - /usr/local/bin/yarn
npm: 6.14.5 - /usr/local/bin/npm
Browsers:
Firefox: 59.0.1
Safari: 12.1.2
npmPackages:
@apollo/client: 3.0.0-beta.46 => 3.0.0-beta.46

[mschipperheyn]

See also https://github.com/apollographql/apollo-client/issues/6354

[benjamn]

Yep, that's the same problem. Let's close this in favor of #6354. Thanks!