I finished the Serpent's Lair quest, but the next main quest, Memories Awoken, never added to my quest log. Even still, I visited the lion statue and Herodotos was standing there, but I could not start a dialogue or cutscene. On a side note, I had visited the lion statue before finishing Serpent's Lair and before the 1.03 update, I was experiencing the Snake in the grass bug.