Earlier quoted context omitted.
Yeah but for educators, it may be a positive signal for plagiarism, as has always been the case.
So if you punctuate correctly, you get accused of plagiarism, but if you don't, then you get penalised for incorrect punctuation... I suppose school is meant to prepare you for life, so it makes sense.
Plagiarism has a long history, and the options are numerous, including using some other student's prior work, or paying a human "homework mill" overseas to research write your report for you. It's usually the differential in styles that will get you noticed, because a teacher gets to know their students and what they're capable of in the classroom.
Also, using a hyphen instead of an em dash isn't "incorrect"; it's a traditional way of writing, because most of us grew up with ASCII, and only the one key on our keyboards. Only a journalism or literature class would be concerned with teaching the distinction and marking points for using those.
I could list about 5-6 signals of LLM generation that I've noticed. Proceeding to investigations and accusations is discretionary, and shouldn't be taken lightly.