I just noticed that there are 2 instances where the incorrect occult eye color is appearing for me.
one spellcaster infant of a vampire and spellcaster did not have either parents occult eye color when becoming an infant so i went into cas with fulleditmode on and changed its eye color to the black and red vampire eye color and when exited to live mode the eye color was the purple vampire eye color instead. I then aged up the infant to toddler and then he got the correct black and red vampire eye color on him and it has stayed that way so far and hes a teen now.
second time is on a young adult vampire from before the update around 10/24 that caused this bug for me. he always had the yellow vampire eyes but he just visited my sims house and suddenly he now has the light blue vampire eyes. he had yellow eyes yesterday. This vampire sim was born in live mode and his great grandmother is a spellcaster.
luckily im playing on a copy of my original save because my mermaids are still broken but it seems this bug is not 100% fixed for my vampires and spellcasters occult features.
Edit: my spellcaster just had a science baby as a single parent and aged the newborn up to infant and the infant had the red and black eyes until i opened up the household in cas to save a copy of it. the eyes were automatically changed to a random human eye color and whenever I try to change the infants eyes back to the red and black the eye color resets to a random human color if I select a different household sim in cas or if I save the household.
I uploaded a copy of 2 bugged infants with occult eye problems to the online gallery if it helps. the household is called "infants bugged occult eye"