Beyond the discussed sense of discovery that is lost after the first contact with the work, it's true that in many cases the author may believe that their research/preparation has economies of scale and they may be less careful in introducing new elements in the next parts of the story, regardless of whether they make sense in the context of what has been created. If you've established a character in one way in the first novel, it may be easy for you to have the character not stay true to themselves later on, because they have a "reputation" for being what they were and readers accept it.
An example I'm used to is how romance writers tend to have the "sequel hook" characters behave completely differently when they are not the protagonists than when they are. Sure, in romance novels it's par for the course that love "changes" the protagonist, but sometimes it feels that the character is made to fit a mold rather than being in love.
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