This is common misinformation. Even in this case, OpenBSD did not break the embargo. After protesting, they received the permission of the researcher to publish

This is common misinformation. Even in this case, OpenBSD did not break the embargo. After protesting, they received the permission of the researcher to publish: Note that I wrote and included a suggested diff for OpenBSD already, and that at the time the tentative disclosure deadline was around the end of August. As a compromise, I allowed them to silently patch the vulnerability. (https://www.krackattacks.com/#openbsd https://www.krackattacks.com/#openbsd)