Unplayed households disappear from the world / lots become empty

Hi, I am experiencing a recurring bug in The Sims 4. Some of my unplayed households disappear from the world completely. Sims living in apartments or houses just vanish. Their lots become empty even though they were furnished before. This happens whenever I play with other households. I do not delete them myself. The issue occurs even with Mods or custom content removed. I have tried clearing the cache and repairing the game, but the problem keeps coming back. I have backups, but constantly restoring them is very frustrating. Please investigate this issue. It affects other players and makes managing households very tedious.