Doing the cube today we got a lucky stage, the tooki one. We killed it and I got nothing, absolutely nothing, 0 rewards. Given the text msgs of the other party memebers I assume they got rewards, but I didnt 
The diamond chest reward “only” gave me 6 solar graces, 2 solar blessings and a purple boook
I’d say that compared to what i usually get it’s low rewards for a diamond chest (especially not having any xp card) but well I guess thats rng.
What is for sure it’s that I got 0 rewards from the lucky stage