Let me say first great job on the translation and thanks to you and your team on this project. Sorry for the late response but once I put this game down and I didn't even want to think about it again. I am still working on posting my review online for this game. It was mentally draining trying to get through this game and all its quest. The section below takes below during the second expansion.
In the " Memory of Mishua (Gran Zedora Castle), its a flashback to the past where you follow butterflies around to different sections to progress the story. In one part you follow the butterfly to a balcony for a scene, then you return back inside to speak with a hooded person standing by the stairs heading down. When I had the english mod installed the hooded person did not show up and I couldn't progress the story. I tried rebooting my switch, but it didn't change. I removed the mod and the hooded person was there, the story progressed forward. The same thing happened when I went to follow the butterflies to the throne room. The hooded person who was supposed to be there was not here again, so the event did not take place. I removed the mod again and the event with the hooded in the throne room happened. The next event with the hooded man takes place on the first floor of this area at an alter and again with the mod in place he doesn't show up, remove the mod and the scene takes place like it should. I am guessing because the hooded person dialogue is voiced, they may cause the problem because with the mod in place there is no voice dialogue, and the hooded person is completely gone. I played through this sequence in early November 2023, so I had the recent patch installed and then a new patch came in November so Installed it. There was another area but I have to look through the notes I made. Again great job on this and thanks.