I don't know how to replicate this. I am doing the Shadow Pan dailies today and the last daily that pops up after you complete the initial four, failed to populate in my Quest Frame. It is in my quest log. These are the same quests as yesterday, and it worked fine yesterday. I did a reload of my interface and the problem persisted. There is no error log to post.
Could this have something to do with the way the quests take a couple of seconds to show up on the frame? I don't use any other map or guide addons with Carbonite, so it is pretty much as is (I do use MiniMapButtonFrame).
If I abandon the quest and reacquire it, it works fine.