On a further note, not only is the flower sea permanently locked off (as per above), but the Pâtisserie event where she is being nelsoned in her shop is bugged with every spoken line only being <NULL> and then locking out at the end, never to reappear or unlock anything. It seem the main quest itself is riddled with multiple hardlock bugs.
Is this game just bugged to shit or am I particularly unlucky?