Any chance of having last weeks old moon npc re-added for quest completion?

I didn't hand in my last old moon ring quest before maintenance as I waited to help a friend do it (who also hasn't handed hers in). Today I find the npc is gone so even though I've already completed the quest conditions, I cannot hand it in and since neither of us managed to enhance the ring to tri, we were both kind of counting on the duo ring from handing in 6 old moon rings.

Upon re-examining the event page, I see it does mention the npc is only available for a week, but... why? What's the harm in returning the npc? You still had to play every day to collect the letters, never mind the moon things to enhance with it which required up to 5 hours play. My initial scan of the page mostly emphasized the April 17th end date when the items would all be deleted so that is what I was concerned with. If the guide to where to hand the quest in is anything to go by, the new npc isn't even standing where the old one was, so there is room for the two them to stand next to each other!

I get that this is probably a relatively isolated issue but... it feels really crappy and like something that doesn't really need to be.