I just completed "The Promethean Code" mission as part of the weekly story playlist. This was my first mission of the week and I did not receive the Treasure of Ages drop. My inventory was not full, I do not have any treasures left over on any character from previous weeks, it did not go to the postmaster or anything along those lines. Oddly enough, I received 35 marks from the completion as opposed to the normal 20. My marks have not been close to maxed out all week, so I don't think it's anything along those lines, but it is interesting that that happened and I did not receive the treasure. Maybe the extra mark drop ate the ToA drop?
Has anyone else experienced something like this?
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There was a bug that if you didn't open a treasure from the previous week before Tuesday reset; then you would not be able to earn that treasure the next week. This was fixed in the 4/20 hotfix, but is probably what hit you here. Sidenote, the 15 marks for the daily appear to be rewarded for completing the heroic weekly story missions as well (20 + 15 = 35). They don't have to be coincidentally the same mission either.