Spent the time and patience to complete a hardcore Void Crusade, full clear. I'm in the room to open chests, I open the supreme chest and the game crashes. I lost all the loot from the mission, from the chests, the shards used to open the crusade, and received ZERO credit for the seasonal challenge. 

Looking around different forums, this seems to be a regular issue. Looking at the community hub here, I see more bug reports than one should ever see in a game that is still "active".