Meow,
I've read in some other novels and games that since the game are in development it is possible that saves end not work after some updates.
True that I've seen that happen in many novels and games. No all saves stop to work or they sometimes move you to another part from the game or its story.
Didn't know that could be possible to fix those or maybe they just focus on that when the game have been finished since not going to have more changes in its story and code?.