Were you writing a forum post? It was lost because it got submitted to captive portal. Were you in dynamic app? It crashed because it got HTML instead of JSON. Does you page reload ads in the i-frames? Your page position and page itself is now lost, and you are in captive portal page. Did you have a native app which did HTTP requests and cached them? Congrats, you have invalid data in your cache now.
And I have seen captive portals which were broken. How about you get redirected to login page every time you go to your favorite website, because the redirect page got cached somehow?
Good riddance. Yes, the browsers should include better captive portal support like android does, possibly triggered by the SSL certificate mismatch errors, but even the current situation when I have to type "aaa.com" by hand all the time is great.