Why are my thing(stairs, billboard, cubes ect) not showing/loading in uefn but , they are there when i launch session

Development Asset Creation
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2024-03-15 03_47_00-Unreal Editor
2024-03-15 03_47_00-Unreal Editor1433×883 112 KB

Fortnite Screenshot 2024.03.15 - 03.48.43.49
Fortnite Screenshot 2024.03.15 - 03.48.43.491920×1080 153 KB