These tools are as good as the information fed to them, so I'd presume they weren't fed nuanced situations. Now why would that be, I have some theories, either the people building the machine didn't think/remember/find such materials to feed it, or these materials are hard to come by.
Reminds me how, also in Japanese, most dictionaries online I found, and even some people I asked about, couldn't tell the difference between 今日 and 本日. What helped me was having enabled the Japanese-French dictionary setting in a multi-language dictionary I checked despite barely understanding French.