I've used double dashes for years and now they get automatically turned into em dashes, and I'm not an LLM (that I can tell so far).
I had to learn the difference between hyphen, en-dash, and em-dash when typesetting scientific papers and theses in LaTeX, and after that it just doesn’t feel right to not use them "properly".
and I'm not an LLM (that I can tell so far).
Maybe ask your doctor to administer a Turing test?