Why were the tag badges awarded so late?
My current score is 467 for 111 answers, and my last activity for that tag is from April 2017. I did not earn much reputation for [nsfetchedresultscontroller] in recent months, so I would have expected to earn the silver tag badge before April 2017, and the bronze tag badge much earlier.
Also it is extremely unlikely that the criteria for the bronze and the silver tag badges are fulfilled on the same day, or that 5 users earned the tag badge at the same date.
Is this a bug or is there some additional condition that must be satisfied for tag badges, which wasn't satisfied before August 10?