I just discovered this awful bug about the dead sims being culled today. I've been playing a sim as an eternal adult, resetting the age with potions, and his first wife, who he interacted with every time she spawned and had quite a high relationship with, is gone from the panel. Her tombstone gives the option to destroy or put in inventory, and has no information but the epitaph I put in on it. All of her paintings in the house are still there, but their artist reads "_____" instead of her name. Yet, dead elderly sims from town that he met little more than in passing weeks ago are still on his panel. I wonder why it would choose a sim that has high relationships with a played household, with the tombstone in the world, to delete, rather than sims without such ties.