"Practice weakest words" is weird
Yay, the word tab is back...but.
I did couple of tries on "practice weakest words", and in both times the lesson was really short, only five and four questions.
Also on the first try I got my "Christmas" lesson strengthened which was a tad odd, because there had been no "Christmas" words tested. But when I looked at my word list, it claimed that beside those few words that had showed up, I have also practiced a number of other words (including those Christmas words).
The same was true on the second try, beside those words I had actually seen, according to the word list I had practiced also a number of others.