Disappearing sims

I play on console and have noticed that 2 townies have completely disappeared. Summer Holiday and Brant Hecking. This is so disappointing because I have gone through and edited each townie with new outfits and changed their appearances. I didn’t think to save each individual household to my library in the gallery so I’m definitely going to do that now but this has made me so upset. Is there anyway that this can be fixed or are they just gone now??? I’ve exited the game, shut off everything and tried again multiple times  but they’re just gone from my save.