Overwrites the default save? Which one is that?
It begins life as 'Prisoner'... then becomes the name of the character you create.
In which case it can become lost in the myriad of other saves people make, some people miss it by chance and others are not so lucky. Other people never create more than one save.
Best bet is to create a completely new save and leave the 'Prisoner' save alone, until such a time as it gets fixed, or just make a duplicate save before you start a new character.
One will always remain.