As Tsubaki said, it's the interactive items (food, flower vases, crafting stations, summoning bells, etc) likely causing the issue. Somewhere around 40-44ish you'll notice furniture disappearing on you. You can start removing interactables one at a time until the issue ceases. It's been around since long before 4.0 though, they just seemed to acknowledge the issue with the 4.0 patch notes.