@SarisenL92
I and others have been troubleshooting this and found that for existing children there is a lot of inconsistency in what happens. Here's what we have found so far.
Any skill that already showed up in the skills panel that a child had already started before the patch can be completed. However, in one case, I had the maxed logic skill disappear from a child just like video gaming used to do. And when aged up to teen, you had to start all over.
If a child has maxed the 4 basic skills but not gotten enough progress for a skill to show up in the skills panel, the skills won't and there will be no progress bar above their head when doing them.
For newly aged up toddlers, it seems that if you complete one of the 4 basics, you can get the adult skills but it is not consistent.
I found that in the case of creativity, that once the skill is maxed, if you do violin, piano and pipe organ immediately, then you can get those 3 to register in the skills panel. Don't do anything else in between. So start one, get it to show up at level one, move to the next and get it to show up and move on to the next. Once you can get them to show up in the skill panel, you can come back later to work on them and level up. I also found if you got one to show up and then went on to work on another of the 4 basics, when you came back to the other skills associated with creativity, you can no longer gain the other skills but if you do it immediately, you can.
Still testing but I suspect that it will work the same with other skills associated with the other basics.
You can still get vampire lore and bowling as they are not associated with the 4 basics. You should also be able to get pet training but I haven't tried that one yet as I didn't have any pets in my test household.
Hope this helps.
Edit: Just noticed something else. Child maxed motor and began video gaming. Forgot that gaming is now Mental after the patch. The child is not gaining any Mental skill while playing video games on console. No progress meter above child's head either.
Edit 2: And if a child has maxed Mental. Working on Motor and sent to Play Keyboard Commander on computer to see if that would still contribute towards Motor. Child is gaining Motor and Video Gaming. So something is definitely off.