Crafting Recipe Requires Banned Item

[PhillyPoo]

There is a specific rune that has a recipe requiring disc 11 which is banned on the RLCraft server. Seeing as this item is important for end game, I would like to see if it is possible to have the item replaced in the recipe. 

[MMD]

Why is the disc 11 banned?
From what i know the banned items list is empty, or is there another?

[Akame]

When you have Disc 11 in inventory, it instantly get deleted and chat says its "Item banned - easter egg issue" or some simmiliar line