Due to my semester abroad, I completely missed the HoW-DLC and therefore, I didnt make it flawless to Mercury. Now in Y2 I went flawless several times with all my three characters, but "The Lighthouse" Grimoire card is still unlocked. I have to admit that I didnt put any effort in finding out if that's a known issue, I just wanted to let you guys know that it seems to be buggy. I really hope that you manage to fix it. :) Best regards from Germany!