This DF engineering weekly isn't reported in the weekly quests list. All other DF profession quests do get counted. (I have lots of alts and this really helps me make sure I did all the quests on all of them.)

https://www.wowhead.com/quest=70539/and-you-thought-they-did-nothing

A spot check of some others turned up these missing from Modules/Quest.lua:

  [70539] = "weekly", -- And You Thought They Did Nothing
  [70545] = "weekly", -- Blingtron 8000...?
  [77935] = "weekly", -- A-Sword-ed Needs