https://bbs.archlinux.org/viewtopic.php?pid=1718106#p1718106
Apparently, NM silently started to require >=2 level domains. I see no info on this in upstream changelog. But luckily they reconsidered: https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=5aa22ed8c9c1944f8843442912561dcec83a11b2
