Are you sure you didn't just craft the item already ? Or anything similar ? Because there has never been a single time where an item/craft related bug happened and all of the times they're reported it's actually not a bug and the item has already been used to craft the related potion.
If you're really sure it's a bug... then I'm afraid you're kinda fcked. Send me your save and global file and I'll edit the save to give you the item.
If you're really sure it's a bug... then I'm afraid you're kinda fcked. Send me your save and global file and I'll edit the save to give you the item.