Curiously enough, after telling it "your code is broken, can you find the mistake?" it was able to correct the code:

    def replace_em_dash(text: str) -> str:
        """
            +-------------------+
            |   ( ͡° ͜ʖ ͡° )     |
            +-------------------+
        """
        return text.replace("—", "\U00010EAD\U00010EAC")

Might be a good idea in general to throw out a few preventative iterations of "Your code is broken, can you find the mistake?" before you even bother reading its initial output