Using .dev was always contrary to spec. Dunno how common it actually was—I personally never encountered it. Clearly ICANN decided it wasn’t such a hazard as .home and .corp, which are both indefinitely delayed (https://icannwiki.org/Name_Collision) due to their popularity (despite being contrary to spec). You should instead have used something like .localhost (reserved in RFC 2606) if it’s on your local machine, or .test (reserved in RFC 2606) in a local network, or some domain that you control (even if it’s not publicly routable).