BSP Brushes disappeared (UE5EA) How do I get them back?

Hello, I build a Level with many BSP Brushes. After “build lighting only” all Box-Brushes are invisible.

They are still viewable in the WorldOutliner and if I double click on them I can see the pivot and the yellow frames. But they are invisible and are not blocking my character.

My hole level is destroyed now. How to get back all my work?

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