Is this a bug in 9.13.1.2?

Three times, when playing around/testing a use case of forgetting my WiFi, then re-joining it, I got this message asking if I wanted to join what I think is the backhaul WiFi - and recommending it. All 3 times I clicked 'Not now', as I know it has its own private password and I can't join it. But this is odd and confusing, and I never saw it before...