I don't know if this is a bug or if this has happened to others but figured I'd at least post about it. I completed today's daily heroic on level 28 and did not get the "guaranteed" ascendant materials for it. I did level and get a mote of light at completion of the mission so maybe that's related to the bug.
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Same happened to me. I'm hoping it was an unintentional consequence of the latest patch. If they meant it then they've just removed a major attraction of coming back to the game every day. I still need the ascendant energy to upgrade my many legendary weapons. Just 'cause you don't need it for the exotics any more doesn't mean we don't need them at all!