I then tried to at least mark a unit as known via the three dots and “know all”, but nothing happens. Am I doing something wrong?
If you check back in a few mins does it show as mastered?
When I mark a whole unit as “mastered” I’ve noticed that it takes a couple minutes for that to show up in the UI. (I suspect on the backend it starts a separate job to do the work while leaving the UI responsive and that job takes a couple mins to finish updating the database)