In an article about how to build your own imaginary world for a game, a novel and so on, there is such paragraphs:
There are two main ways people notice a writer’s worldbuilding:
The writer makes it too obvious they are in love with the world they created by having long informational dumps and exposition explaining the things they came up with.
There are holes in your worldbuilding that lead to inconsistencies.
The first is an example of bad writing. Long exposition dumps tend to be boring for the reader. But, even worse, when characters notice or explain something in the world, you’ve probably made them break character.
What does 'break character' mean here? Wiki has a page for 'breaking character', but I don't think it fits in here.
Best Answer
"Breaking character" is a good metaphor or analogy for this kind of writing mistake, but it's not literally true.
By definition, only a real live human actor can break character. It's revealing to the audience that the actor is not really that character. This breaks the audience's suspension of disbelief and their immersion in the story.
If a fictional character in a written story starts saying things which are clearly in the author's voice, this is comparable to an actor breaking character and revealing their true person, and it similarly breaks the audience's immersion, but it's not the same thing.