One more bug: when the Lamia reaches 0 hp it doesn't die and you're stuck in that battle.
Two more bugs:
Leaving the underworld removes Faero. There is no indication or anything saying this can happen, he's just gone.
I also got soft locked again at Mount Pyriux where somehow the stone in the middle was used and I couldn't access any switch to get it to come back.
Also possible to get soft locked in the hotel if you don't have anything to resist paralysis and can't defeat the boss, or if you run out of health/mana restoring items.
It's also possible to fight the lamia over and over again by repeatedly going over the square that triggers the battle.
After defeating exus, trying to go to celscia triggers a cutscene that locks up.