NetworkManager.singleton.channels.Count gives 0, but after playing some time with the project is started to show 2 (2 is expected)

2. How we can reproduce it using the example you attached
- please see attached video
1 Open attached project
2 Press Play and Start Host - notice the log "NetworkManager.singleton.channels.Count = 0"
3 Select NetworkManager object in Hierarchy and go to Inspector, there select "Advanced Configuration" - notice the log "NetworkManager.singleton.channels.Count = 2"

Expected results: it should be 2 all the time
Note sometimes it fixes by itself - I tested it a bit and seems to fix it you need to do:
set "Advanced Configuration" in Inspector for NetworkManager and then press Play, then exit Play mode - now you can uncheck "Advanced Configuration" and press Play - it will always be "NetworkManager.singleton.channels.Count = 2"