I was searching in a Forgotten Library and found a Spellgem:
Imagine my surprise when the Spellgem turned out to contain not Shadow Wrap but Levitation... or at least that is how it was labelled in inventory tab and in spell triggering dropdown. It was also labelled as Levitation when I gave it away to a random stranger:- You search and find a Small Purple Gem containing Shadow Wrap. (2022-01-16 16:14:58).
I forgot to note down item's ID but I asked An True to not get rid of it so it may still be available to investigate. Her character ID is 7681.- You give your Small Purple Gem containing Levitation to An True. (2022-01-16 16:16:44).