I couldn’t fix this. I’ve also checked in with deaderpool cause I was curious about the way I changed the child body shapes. It turns out that I was glitching their appearance with MCCC and doing something that shouldn’t have been possible. It just so happens that the recent patch “fixed” the bug I stumbled on without knowing it.
As for the Slider, I did get it working in CAS but no changes update in live mode. I would say it’s still broken.
To repeat what luthienrising has already expressed in their list of broken mods, is that using sliders could effect your ability to save your game.
The only thing I would definitely say was a bug is the fact that the 3 default presets from the vanilla game can’t be updated in CAS. When I experimented with everything, mods and no mods, the one consistent thing was that physical changes to child sims in CAS after using the cheat CAS.FullEditMode revert after returning to live mode. I do believe that there is a legitimate bug with child sims.
However, after Deaderpools answer to my questions and my own tinkering with slider mods, I do not think the sliders will be working again anytime soon. More specifically, you might be able to get Sliders working in CAS, but the changes will not update in live mode.
Additionally, I suspect you could risk your save trying to use these mods if what I’ve read is correct.