Unload Stream Level node not working in BP-based Floor Switcher

Hi everyone, UE beginner here. I’m building an architectural configurator where the camera moves between floors. I’m using a “Set Comparison” logic to load/unload sublevels so that shared assets (like the building exterior) stay in memory while specific floors swap out.

The Problem: While the Load Stream Level nodes work perfectly, the Unload Stream Level nodes seem to be ignored. The “Old” floors stay in the viewport, leading to overlapping geometry.