Here is what I spotted:
Windows 10 Pro 64 Bit (1803)
Cubase 10 Pro
Open a project with some different channels (Audio, Input, Groups)
Open the Mix Console (F3)
Enable the Channel Overview (if already enabled, disable / enable first)
Verify that all channels are showing as in the mixer (as set in the Channel Filter)
Change Channnel Filter to show only one type of channel, for instance only Audio channels
Check the Channel Overview > it still shows all channels
Now disable and enable the Channel Overview again > it now reflects the filtered view as in the mixer