I can say that for me canon is just season 1-3A because that is when the story actually ended, and everything else is just a badly written fanfic that doesn’t make sense, but that won’t be true.
Or someone can claim that season 4A is canonial to the Frozen movie franchise, but it won’t be canon cause the creators of the movie didn’t accept it as canon and they can actually contradict it in the sequel (I kind of hope they will do it) because it is not canon to the movie.
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"All your questions are pointless"