yeah, Blizzard sucks! They broke the bloody cage that you get DAL from after completing A Stolen Stone Fiend and then after they "fixed" it, they broke the spawn on the WQ which was spawning every 5-7 days and hasn't spawned now for 15 days and counting /sigh
I think it is worth noting that Animated Ulna is NOT a guaranteed reward for the WQ, but only has a CHANCE to drop. I, as an example, did NOT get this part by completing the required pet-battle(Extra Pieces).
There are Pet WQs to get the upgrade to rare often, including in bfa. Last week, I counted at least 6 such quests.
Does anyone know if the WQ item is offered again once you've already created the pet on that character?