Usually the simplest reason is the best or right option, don't over think the problem, afterall, it is EAxis we're talking about.
True enough. I was sufficiently curious that I just tried it myself. Moved a family into a brand new Sunset Valley and all three sims kept their drum, piano, and bass skills. This was the current style Sunset Valley that has the Ambitions buildings added to it, but I doubt that makes a difference.
So Nutboii, there must be some other glitch that caused your sims' problems. For the record, I'm not using AM, only mods are the NRaas MasterController, OverWatch, and Decensor plus some of my own.
Yeah, I was afraid it was something else. The neighborhood they moved into was Sunset Valley with no LN buildings, straight from scratch. I'm using AM, Nraas Woohooer, and probably too many other mods. When I'm less lazy (and more moved into my new place with some time on my hands), I'll narrow it down to the culprit. Thanks for testing though!