Difficult words is not working correctly on the web

For the last few days, the “Difficult Words” function has not been functioning. I use Google Chrome on a Mac, and I don’t think I’ve ever had this problem before.

This bug (actually it’s two) has been there for quite some time on Android (see #4 and #19 in my bug-list that you can find here):

I’ve never seen it on Chrome, but as #19 in my list resurfaced with one of the last two updates I suppose they might have again broken something which now carries over to the web.