DataSmith imported BIM model partially visible ingame

As the title states, the whole BIM model is visible from top to bottom, but when I enter PIE some parts (precisely the upper ones) become invisible when I possess a player camera. If I unpossess from the player while still in PIE, it becomes visible again. I figured by clicking on the player pawn that the problem resides in the player camera but soon noticed that it happens for all camera components I put in the level. You can see the results in the figures below :

Hello,

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Thanks