Ok, because I checked the recipe with only Madclown and Madclown + Bob, and the recipe was not hidden.
Maybe there is a setting for it, if so, then I will put that on my to-do list.
Where I live it's currently 22:46, so I will be going to sleep pretty soon, in the morning I will make an Update which Disables the recipe when playing with Madclown / Madclown + Bobs, if this is how you want it