I think if you got one version in your inventory, the recipe disappear
For example, if you don't have rare Optic Reboot, the crafting spec still available. But if you acquire one while looting a netrunner or from an access point, the crafting spec disappear. Then it reappear if you sell it (you have to sell all if you have multiple to make it reappear).
They are not meant to make money.
I already posted a "test" in this thread
I have both PC and XBox versions of this game and my crafting specs for quickhacks have disappeared from both to spite having had them and still having the perks that allow for them. WTF?!
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