I’m not sure if it was intended or not; but, when looking at the trade skills - harvesting in particular - it says farm plants are able to be tracked at level 20 and it shows a symbol that I believe represents herbs. Even so, herbs are not trackable. It’s quite annoying and definitely would appreciate a fix.
On a similar note, I have experienced and odd bug at times in which I don’t get anything tracked - despite having the right levels to do so.