Recently I've encountered this odd bug where I can't change/edit my vampire's dark forms at all. I use a mirror and select "change sim" and all I can do is change the eye's hair, clothes etc. same goe...
Go to CAS from Manage Worlds. Click on the lot your sim lives on, click on three dots and choose Manage Households. Click on the pencil icon to go to CAS. I have found this is the only way to change sim's facial/vampiric details in CAS without cheats right now until they fix the Change Sim issue.
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