I have two saves, when I load the one on the left, it works but when I load the one on the right, it doesn't
and they are from the same version/build
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I guess some new variable was introduced at the "questioning" of Nina most likely as that seems to be the point at which older saves stop working.
Meaning the first save being before that the game is content because it is not there, because it is not set yet.
The second save however the game throws a fit because the variable should be there but is not.
It does not have to be a new variable.
It could also be that he fixed a typo somewhere outside the dialogue (as the game does not care about that).
To clarify.
EVERY save from
EVERY game (not only AVN) has the possibility that they don't load in new versions.
Expect they do not and be glad if they do.
In many AAA titles you are not able/allowed to even try and load them.
Why specifically in the AVN sector it is assumed older saves have to work is beyond me.