I have a 3D model of a building. In scene view, the side view of the rooftop has disappeared somehow, but I’m not sure what is the cause.

In top view, the rendering works fine.

I tried changing the near and far clipping planes of the camera, making the near clipping plane as large as possible and as small as necessary. Meanwhile I made the far clipping plane as small as possible but as large as necessary. That did not work.

What could be the possible cause of this issue and how can it be fixed? I can provide images of the wireframe if necessary. Thank you.