Double Diamond Doesn't Do Dang Diggity

I've been trying to do this for a while now, and felt like I got it several times, but none of them triggered. I'm following a video, even going to the edge and hugging the last row, but nothing's triggering. Is this a bug, could someone manually award this?

(check the end of this video):

Known, Double Diamond currently doesn't work and there's no way to activate the challenge. Will be fixed in a future update. ^{_{higy pls}}