encountered a few bugs today while doing the quest First bug: the Tachions you get while doing the first quest that requires 10(Protect Ludibrium) don't count for the second quest that requires 300(The Replacement Time Energy) in this picture you can see that I have a stack of 100 and 6 more Tachions(that I looted during Protect Ludibrium), yet the quest helper doesn't count them as the quest item in the quest The Replacement Time Energy it only counts the 8 that I just now collected after starting the quest(which also can't be stacked together with the other Tachions) second bug: right after finishing The Time Sphere quests that gives you a dimensional crack, it gave me one then took it away immediately. then it gave me the option to start a quest as if I lost the crack(going to Flo then he gives you another crack) third bug: most likely connected to the previous bug mentioned with the disappearing crack. after getting another crack from Flo, I started the final quest Papulatus in which you must loot a Ludibrium Medal to gain access to the boss area the thing is that it never drops, the game probably doesn't recognize that you're in the quest and doesn't activate the drop to fix this I forfeited the quest, re-started it and then relogged and the medal dropped.
the 1st one isnt a bug. the 2 tachions are different items, similar to the dragon hearts for bahamut quest having different item ids