Since true kin can undergo the crystal transformation,

[Ashe]

Since true kin can undergo the crystal transformation, their cybernetics will be implanted where possible into their new form. However, the crystal body parts are non-biological and new cybernetics can not be placed into these slots. Desired behaviour would be that true kin can still use the recipe (even if barred from learning it while in true kin bodies, like with slog/cloaca surprise) but consistency in either all cybernetics are trashed or all cybernetics are allowed.

[Jason Grinblat]

we'l leave in the trick to get the recipe as true kin but it's not officially supported. wontfixing for now