Ideas
I don't usually post in here but I think I found a bug no one has talked about online yet.
I was gonna send my sim to sit on a skill class, and I noticed that some skills from the new Adventure Awaits pack (specifically archery and papercraft) are being shown here despite the fact that I do not own the pack. I made him go to the classes, and again, despite not owning the new pack he was able to learn the skills. Just thought I should bring this to someone's attention. Pictures below proving I do NOT own the pack, the skills available in the skill class menu, and my Sim gaining the skills.
I play on PC, and I do use mods, but I have no mods that add any additional skills so I don't believe that would be interfering at all.
Also! It seems like the diving skill is available as well, I didn't notice it right away.