One of my characters is suffering from this and several other bugs:
Bug #1: This happens after completing the critical path quest in Magran’s Teeth and waking up in the Palace. After choosing one reply the scene halts. Aeldys and the pirates won't walk into the room from their spot by the door and no-one but the Queen and Atsura (he’s there because the Hazanui went kablooey) will talk to me. The Queen will offer me the Powderhouse Bomb quest, but the main Ukaizo quest does not appear on my list. I have replayed this from an earlier save at Magran’s Teeth just before speaking with Eothas and the outcome is always the same, the cutscene does not trigger.
Bug#2: This has been reported in another thread as ‘replaying maps’. What happened is that areas that I had explored were covered (both map and in game) and gave me EXP like if I was exploring them for the first time. This includes contents of containers resetting so I could loot them twice, as well as enemies, like Lord Admiral Imp and Torkar appearing on the maps anew even if they had been killed before. The Fort Deadlight reset was very strange because Mirke respawned along with everyone else, even if she was in my active party, so I could now take my sidekick Mirke to meet her identical twin.
Bug#3: At some point, I discovered that I could not change my party members at the inn, even if I had recruited and used them earlier in the game. At the inn, I can "recruit" and press "accept" but when that's done they just don't get added to the party like the ones I was using. I had three companions on the reserve at the time when I discovered the bug, Maia Rua, Xoti and Tekehu, and they have all been affected by this bug. I managed to find a Tekehu twin hanging out at the Watershaper’s Guild and I recruited him anew, and I could then add him to the party again, but his level had reset to 4 and he lost all the gear he had been using before. I haven’t been able to track down the twins of Xoti and Maia, so I am locked out from using them.