Figured it out myself: If anyone else is having the same problem, you only get the softlock if you enter Luminessa from the world map. If you go in through the crystal, it works, but it's an old version that doesn't work quite right. You have to go to the gate of the Divine Palace on the far north end, interact with it, and then it'll rewind the story to before you got on the ship. Proceed as normal and it'll work when you reach Luminessa again.
(It says as much in the changelog.txt file, but it wasn't clear to me that you had to use the crystal to get to the divine gate in the first place.)
One more thing, I assume the lost stashes in Fellhorn Ruins, Windy Canyon, and Fierra Falls (below) are inaccessible for now:
But just in case I'm being a dumbass, is there something I'm missing?