Frustrating occurence last night, and FYI for YOU
Beat the part 4 of the raid last night, went to the chest on the left, double-clicked on it, and my loot popped up in the treasure window.
I double-clicked on the first item that was mine, and I was instantly killed, and transported to part 5.
Unfortunately, the alter was underneath the trasure window, and somehow, when I clicked on my loot in the chest, it also registered me clicking on the alter.
Everyone, be careful, cuz for some reason, I was able to click through the treasure window, onto the alter. I lost loot, but I'd hate to see that happen to others as well.
I reported it as a bug, we'll see what happens.