4/28 daily achievement bugged?
I haven’t heard about this happening to anyone else. It seem more likely that you completed it and accepted the chest out of habit (I’ve done that before).
Still, you can report it as a bug via a support ticket — if it’s happening to others, they should be able to tell you.
John Smith: “you should kill monsters, because killing monsters is awesome.”
I hadn’t finished mining (I was at 60% of what I needed so there wasn’t a chest) which is why the Daily Completed was weird when I logged back in. I’ll put in a support ticket!