I can only speak for Chinese courses, but single character answers (where you type Chinese) are accepted, but multi-character answers are marked yellow unless you type the pinyin with spaces in between the words. And the comma problem is back when you type English words as answers. Quite frustrating.
Edit: I might be mistaken about the comma issue, but it definitely happened with one word. And the system gets confused about certain word alternatives. E.g. - “heart’s blood” can be written as “xin xue” or “xin xie” (both of which are 心血) - but the system only accepts “xin xie” - and again only when written in pinyin.