Agree with above, and I want to use this thread to give feedback on a different problem I have with the event too if that's okay:
While it makes sense to keep the details secret for more story-oriented quests (like hidden dungeon), it feels unnecessary doing that on a simple item-collecting quest like this. Sure the item names should be a secret, since figuring that out is part of a fun quiz. But the number of items required shouldn't be a secret.
The reason for that is: Some of these are extremely time-consuming quests, and not everyone has the ability to complete them. As a casual that only farms a few hours per week, it's literally impossible for me to complete some of them, unless I straight up buy all the materials from market. I couldn't even reach the 11th quest OP is talking about, I only know about it from a friend that has been struggling and venting about it.
And that is not a problem, it's completely fine to have some challenging quests for the more hardcore players, I'm just not the target audience for some of these quests. But if that's the case, I should at least know that beforehand so that I don't waste my time trying in vain, ending up with only frustration and no reward. Will it take 1 hour or 20 hours? If I know that I can just say "okay this nth quest is not for me, whatever, gg" and give up without getting frustrated, and that's all I want for the next event.