jeah its kinda annoing, every new page you drop, you have to check again in the achievments if you already have them.
Since the library isnt updated the item is always "unkown" to the char
PC EU
vAA HM / vHRC HM / vSO HM / vMoL HM / vHoF HM / vAS HM / vCR HM / vSS HM / vKA HM
They're updated when you first read them - read it, go to your Eidetic Memory and it'll say 1/14 (or however many you read at that time) - but if you change zones or otherwise reload it'll get zeroed out again. Not that it helps you, but it might narrow down the issue for whoever on the dev team reads this.
jeah its kinda annoing, every new page you drop, you have to check again in the achievments if you already have them.
Since the library isnt updated the item is always "unkown" to the char
No. It will, at least without addons to modify the tooltip, tell you in the default UI if you know it or not. It is not checking the lore library but the achievement instead.
You can't use the same motif twice on the same character.
I know this because I am always passing these motifs to my main crafter alt and every other alt after that one has learned it. It definitely lets me know when one characters has already learned it or not.
The only issue this bug causes is that you are unable to read the motif book, as far as I know, from your eidetic memory after using it. This is why it is a minor item on their list to fix.