Why is the object from the blender in the unit displayed incorrectly?

Question

3D

Why are the faces in the cylinder that are cut out visible from the side, although they should not be visible (everything is displayed normally in the blender)?
How to fix. Blender version 2.79, Unity 2020.2.1f1

Answer 1

it is worth checking the normals they should be blue, if they are blue but still the same bug is worth applying model transforms and checking that there are no ngons.