Incorrect Game Behavior
We have become aware of an issue that prevents the proper saving & loading of system save data while any individual character's voice had been turned Off or switched between Legacy and Modern. That is, the issue will occur any time the "Enable Voice (All)" option is displayed as Custom.
While this issue does not appear to affect individual save files, it has a negative impact on the game's internal tracking of the clear state and scene clear progress when it occurs.
We apologize for the difficulties and confusion that people have experienced, and extend our thanks to everyone who has shared their experiences to help us understand the situation.
Temporary Solutions
Please use the "Enable Voice (All)" option to switch all voices between Legacy and Modern settings before closing the game. This should prevent corruption of the system save data.
Update Plans
We are currently working to create and test a patch to fully resolve the issue. We plan to release this patch as an update as soon as it is ready.