Imported Datasmith Model always loaded in the world partition grid at runtime

I am a begginer in Unreal Engine and I am testing the new world partition feature in Unreal Engine 5 using the default third-person game template. In runtime, I could see those default models are loading and unloading depending upon the player’s location. But once I imported some custom geometry using datasmith and these models are always visible in the viewport while testing the worldpartition at runtime. Any idea how can I resolve this issue?!

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Here is another clip showing the problem clearly; The blue color cube is loading and unloading properly during runtime depending upon the streaming distance; but the white color geometry at the back; that I imported into the scene using Datasmith; is always visible during runtime. Any idea why that model is not unloading even if it is beyond the streaming distance?