I obtained an eternal unreal hood from a mythic enemy. Decided to convert it for the meantime in hopes of getting the same that has 100% mythology on it.
When i looked it back on the enternals codex the entry for the said item is unchecked. Unlucky? 
I think I responded to you via email today! If not let me know 
If it was an item before the patch was released you will have to find it again
Checked my emails, nothing new.
Got it after the the patch
oops sorry, I guess that was a different user.
I will see if I can reproduce that issue on my end.
What is your dq account email? I will pull your save game down and have a look