Modpack version
1.57 (Server)

Can the issue be reproduced?
Yes

Issue
Hi, I'm currently playing the modpack on a server and noticed that you can OreDict other mobs head to the Wither Skull, I tested it using Dank Null and Drawer with the oredict upgrade, was that intentional?

Updated the server to the 1.58 version and still could do it, I've made a short gif to show you:
Bug Replication

Edit: Looks like the bug doesn't work anymore with the drawer w/ conversion upgrade.

I mean that definitely shouldn't be happening, I don't think it's intentional, lemme investigate that

EDIT: Okay so they're all registered under the oredict "itemSkull", that explains the conversion issue, but idk whether there's a way to easily fix that rn, hold up. Okay, nevermind, I can't seem to reproduce the issue with just... any two skulls. Can you give more information as to what you were doing when thi shappened?

That /dank/null one should just be added to the OreDict blacklist.