Jett's Free Mastery Book Question

 Spoiler

I don't really have any other way of showing it haha, but it definitely worked fine and on the mastery book itself I remember it saying "Job: Jett's" and not Corsair or Jett.

thats the current issue right now
the people who reached level 70 went ahead with the eight-legs eaton
this came in 2 versions: Corsair and Jett

so there in lies the issue with nexon

EDIT:

ok to test out whether the corsair book was working on jetts I did the following
leveled a new jett to 70 got the eight leg eaton taht said corsair on it

"Cannot use this mastery book"

so guys dont buy it, dont get it, dnt use it till nx fix