Yeah, you can use the modding tool to "dump" the files (or just check the wikia), and its clear the recipe just doesn't exist for debuf potions + arrowheads. Maybe they intentionally removed the recipes? But then somehow forgot to remove debuf potions as well.. lol.
Anyway, I looks like this latest patch actually introduces more problems then it fixes so I think I'll pass on it for now..
EDIT: So, just dumped the Object File, searched it.. and low and behold there is NO debuf arrowheads at all, they just dont exist. The "DeBuf All Arrows" exist in the game apparently, but not the heads. (or if they do exist they aren't in the object file, somewhere else maybe)
I could probably make a mod as a work around, but I'm not entirely sure how to create a "New" item.. the recipe shouldn't be too hard.. I can use "Normal Arrows" as the Part 1 and the Debuf All potion as part 2 to make the arrows, basicly just changing the order of the crafting steps..