@SimGuruModSquad, are genetics in CAS ("Play with Genetics") and Gameplay the same? I've only tested genetics in CAS, so that would explain the different results we've gotten.
ETA: Nope, still not working, even in gameplay.
ETA2: Fortunately, I had some backups from a few days ago, before I rewrote the add_slider cheat, I thought that maybe I broke something?. Unfortunately though, it's still broken, which again leads me to believe that the developers changed something related to genetics.
TL;DR Took some backups out of storage, put them in game, didn't work even though they were fine a few days ago.
