I've had something possibly related happen. A couple of times a sim that I created, but which I was not actively playing, has lost their name. I gave that sim a name when I created them in CAS, and they had a name for a while, but then one day I discovered they no longer had a name. But in every case, I discovered the problem while moving sims around in household management. I was able to give them their name back by taking them into CAS and just re-entering their name. So for me, they were showing up in household management just fine.
