this is in studio
this is the original in blender
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Your normals are most likely flipped. Just go into Blender, select the faces that are appearing invisible, and hit “Flip Normals”
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If I had to guess I’d say the faces shown are probably inverted Normals. In the edit mode click the following buttons. Viewport overlays>Display Normals. I’ve included a photo to show what that looks like. if there is a blue line sticking out of it It’s flipped. If this is the case you can select the flipped Normals and use the Alt+N shortcut or from the flip them directly from the Mesh button
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