I had to move my sims off the lot and then bulldoze the lot. Then move my sims onto that empty lot and place the house again to get the option back. I hope there’s another fix cuz it was a lot.
I ended up doing the same thing. I tried moving just the Decorator Sim from the house (split household) and that didn't work. I moved all of them out to another lot, and then back in. That did the trick. It only happened after I chose his own home as a client. His wife is part of the main Sim family and I didn't realize that the name I was choosing was his home and not her family member. It hasn't happened again since I have been careful not to choose his own house.
I'm not sure how to do that (report as a bug), but I can tell you, even after I did all of the above (moved households, etc.) I still had the option of choosing the house that Sim lived in. I have another household and made one of the SIms an Interior Decorator. So far, she hasn't had the option of choosing her own house. I appreciate the reply! I will report back on this thread if it happens with the other Sim or if the current Sim suddenly gets the option again.
