Can confirm
Alright so it is only happening in two completely unrelated worlds which one is on a server hosted elsewhere and the other is a local map. Since @The3F4114n0n3 was unable to reproduce could i get an idea of why it may be happening then?
Can confirm on his/her level but when i created a new level with the same seed it was fine. So it might be a corrupt world
Kumasasa asked for some screenshots from MC-31771 so here they are. Dinnerbone i am unable to reproduce now in 38a may have been a hiccup or something.
Enchanted book with no yellow text or enchantment name.
Enchanted book from 38a issue fixed.
This is an existing world from 13w36a. The books are from 13w37b and what is strange is when i downgraded last night back to 13w37b from 13w38a and enchanted it was fine. And carried over to the 13w38a when i upgraded back to it. The issue seems to be fixed but i do still have two books that are missing there stuff. Will post screenshots in MC-30822
Can confirm here is console output as well.