I recently did a short stint teaching English to university students. This is English as a second language (possibly unnecessary context) but the level is fairly high. The course was hastily rearranged to prevent the students using llms. They had to hand write their essays under supervision, which made them a real pain to grade btw.

Then I was asked to review the questions for the final exam and I noticed some pretty weird constructions in the sample texts and sentences. Nothing completely grammatically wrong just unusual or semantically off. The example I recall was "... disproportionately affects men and women" but there were other worse examples. You can guess where this is going. But I knew that another native speaker had written the listening texts so I didn't want to directly criticise these, and I thought they might have been pulled from magazines or some corpus. But, of course, the course leader had generated them with chatgpt.