I am having this issue too but a temporary fix I found on this Reddit thread seemed to help for anyone else dealing with this bug: if you unsave the Sims on Cupid's Corner (as in removing them with the trash can icon after meeting them) and opening the Sim in CAS after unsaving them it seems to fix the vocal bug. I couldn't say what exactly but it does seem to be tied to the Sim being saved to Cupid's Corner specifically.
Thanks so much for your post—it was incredibly helpful! I had the same issue, and your explanation and workaround helped me fix it. Removing the Sim from Cupid's Corner and opening them in CAS really did the trick. This definitely seems tied to the Sim being saved there.
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