No Ground Antlers?

[Goatroach]

I can't grind antlers for the Amor recipe; Henry just automatically drops them into the wine.

Is this a bug?
If not, how do I grind the antlers?

[Ornlu Wolfjarl]

You don't, it's impossible to grind antlers or tusks right now. Dropping them straight in like the game forces you to will still make a successful potion, if you follow the rest of the recipe correctly.

[Yorgi]

It's over two years now and bug still exists.
If there's no way to add feature for grinding antlers, why don't they just update a recipe?