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. - âheartâs bloodâ can be written as âxin xueâ or âxin xieâ (both of which are ĺżčĄ) - but the system only accepts âxin xieâ - and again only when written in pinyin.