So earlier I had the cursed chest bug where trying to open crashed the game, but that was fixed and I’ve opened a couple since. Today I completed another chest quest, which was to destroy a number (15 I think?) of Nyx towers, which I did. However, instead of the open chest button, I got this message. So here I am.
Well, for whatever reason when I took a look at it again now, I was able to open it. Mysterious stuff.
Probably an auto ticket or alert did it for you