As title says El's corridor normal and hard mode is bugged and the dungeon cannot be completed. You get stuck after the initial 3 rooms and the game will not teleport you to the next room. Most likely because certain enemies are missing from the 3rd room.
Chung from normal mode does not spawn and thus cannot complete the room and continue.
Neither does Ciel in hard mode 3rd room making you again unable to continue the dungeon even after getting "Clear" message.
Please fix this otherwise certain quests cannot be completed at all!