Pretty sure it’s intentional my current save file I have a couple a spell faster and werewolf and they have 2 kids. One is a werewolf and the weak bloodline trait and the other has the weak bloodline trait but I’m pretty sure she is not a spell caster and has no innate magic abilities while we’re sister got the werewolf gene
I agree that this is by design. Werewolves, and other occult Sims, cannot become spellcasters because the game is not designed to support hybrids. That doesn't prevent them from inheriting a magical bloodline, though, or the Glimmerstone that comes with it. They can even pass the bloodline on to their own descendants if it's strong enough.
Most occult Sims can be "cured," if you want, and that should allow them to become spellcasters.
