Possibly a dumb question, but I honestly don't know: Why would an update that adds a new life stage break CAS cc for other life stages? I didn't have any cc at the time of the toddler update in early 2017, did that one break everything, too?
For past updates, when we got more hair colours, skin tones and makeup sliders, the logical consequence for me was that those additional options wouldn't apply to already existing cc in my game. But other than that, everything was fine. I've also created some cc items myself (mostly clothing recolours), and now I'm worried how those might be affected because I doubt that I have the modding expertise to fix any problems that might occur.