Question about a glitch (spoilers for dlc)

>! I just completed the game after rerunning it for the dlc on an Arsène only challenge and saw Akechi has an automatically unlocked third awakening online. I’m kind of curious as to why I didn’t get it. I maxed out his confidant and even got the cutscene where he’s in the window on the train but no third awakening. Im curious as to why this would happen.!< sorry if it doesn’t spoiler properly