Does this setting do anything else? sounds like it might..
Yes, I didn't disable firewall when I used Hub 3.
The 2018 firmware enabled an additional option, I think this is right, not at home to check.
Navigate to routers web interface
Under the Advanced Settings -> Tools -> Ping menu
Tick the WAN Ping Respond box
Apply/Save changes
BQM should soon start showing ping responses, rather than solid red
23 years of broadband connectivity since 1999 trial - Live BQM