And where it doesn't change anything? In npc editor?
Or within the game generated new trans character (the already existing npcs wont benefit from it)?
You can check the blend_penis functionality in the editor too, if load and apply (upper left corner) the file on a female npc.
(There is two option with it: 'blend' will mash up with existing genital, 'load' (aka without blend) will replace that.)
Finally, it's possible you're right, but it means it isn't possible to alter futa defaults in a conventional way (just like that
Ravenger6660 is made for you). Btw it is a skeletal mesh addon with own defaults somewhere, and is missing from the beauty standards too.