Just found another bug you may want to know about. If Lianna has perished in combat, and the storyline removes the other characters from the party before she is revived, you get Game Overed, because she is the only one in the party and still at 0 health. If possible, you might want to add healing to the beginning of any end-of-chapter cutscenes at the start, rather than at the beginning of the next chapter.
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Oh that's indeed an issue. Someone encountered this issue before and I thought I had already fixed but but oh well.
I'll double check every instance the other characters are removed (mostly near the end of a chapter) and add a line reviving Lianna before removing them. Can you tell when it happened to you?
They should, as I copied their effect from one of the game's default item list. You only get one EXP message at the end of the fight, as the EXP is distributed to the whole party, but the goggles' buff is character specific, so I'd suggest you take a look at your characters' status screen. This is probably just an RPG Maker thing.