We looked into the issue with the extraction runes and here is what we discovered.
The extraction runes were modified in KR around September to be only usable on equipment with enhancement level +9 and above.
This change was not due to happen for the NA version until the Miri update. Unfortunately this means the change was prematurely implemented in our version before the description text and change was supposed to be announced. Hence why there is a bit of confusion in regards to the functionality of the extraction rune itself.
We have since notified Customer Service of our findings and apologize for any inconvenience this issue may have caused.