Until recently, there used to be this useful feature during review sessions that would tell you “Sorry, you typed the [wrong column] when we wanted the [correct column]. Try again.” when you entered a word from the wrong column, and then gave you the chance to try again. Many people used this for synonyms.
This bug got partially fixed insofar as that the message pops up again when you enter the first word from the [wrong column], however, it doesn’t work when you either mistype that word, e.g. “blackbird” instead of “Blackbird”, or, when you enter one of the alternatives that were added to [wrong column] (since there is often more than one synonym).
This feature was great and made courses much more useable, and I would love to see it functioning fully again.