I have created new tag wiki (and its excerpt) back in June 5 and kind of forgot about it.
Today I suddenly noticed I was awarded the Tag Editor badge for that wiki although I created, not edited, it.
I checked the List of all badges and full description which clearly says in the Tag Editor section:
You need to edit an existing tag wiki; creating a new one does not count
While I really don't mind extra badge, I also wonder if this is by design meaning change of rules, or just a local/temporary bug?