“Fresh” is pretty muh a synonym of “Raw”, you could use for both.
For example:
This is raw meat.
This is fresh fruit.
They could both use the 生 kanji.
Its pretty hard to pinpoint one meaning for every kanji because in Japanese it can mean several things. It’s not that WaniKani is not accurate, its that both answers are esencially the same and there is not only one exact translation.