Changes are not registered when modifying QoS Type or adding/removing channels in Network Manager

1. Open the attached project
2. Open the available scene
3. In the 'NetworkManager' gameobject, Network Manager component toggle 'Advanced Configuration' on
4. Add 3 new channels to the 'Qos Channels' box
5. Ctrl-S, Save scene
6. Open the scene once again
7. Check the channels

Result: New channels did not get saved and are missing

Workaround: After step 4 create dummy game object in hierarchy to make scene dirty

Regression from 5.2 to 5.3