なるほどこれひどいな
Google Chrome/Chromium 69 で www.hoge.www.matoken.org が hoge.matoken.org に見える

"881410 - Incorrect transforms when stripping subdomains - chromium - Monorail" https://bugs.chromium.org/p/chromium/issues/detail?id=881410

Workaround
chrome://flags/#omnibox-ui-hide-steady-state-url-scheme-and-subdomains

試した環境
$ dpkg-query -W google-chrome-stable chromium
chromium 69.0.3497.81-3
google-chrome-stable 69.0.3497.81-1