I’ve made a course for practicing Chinese character pronunciation (https://www.memrise.com/course/1111277/yi-zi/) which is now experiencing issues.
The course prompts with a Chinese character and requires a pronunciation written in hanyu pinyin (roman alphabet with diacritics) as an answer. Previously I had no issues with this course, but it is no longer able to distinguish between roman letters with different diacritics e.g. mā, má and mǎ are all accepted as ‘correct’ answers when only mà should be accepted.
In addition to the four tone marks (ā, á, ǎ, à), the course is no longer able to distinguish between lu and lü (two different sounds in Mandarin). This essentially breaks the course.
Does anybody have any suggested fixes?