Guild Wars 2

The reward for completing the Nightmare fractal Challenge Mote has changed from rewarding a weapon skin to a cosmic infusion. Was this intentional? And are players who opened the box prior to this change getting The cosmic infusion from Nightmare CM achievement as well?

Perhaps, this will answer some of the questions: https://forum-en.gw2archive.eu/forum/info/news/Fractal-Nightmare-Chest-Disabled/first#post6654915

Good luck.