Use Complex Collision as Simple, Double Sided Geometry

Hi, I am using “Use Complex Collision as Simple” with “Double Sided Geometry”. The collision works well outside the model in all triangles, but when I test the collision inside the model there are areas that do not collide. Why does this happen?
I emphasize that it is necessary for my project to use both options for the level of precision and that they work on both sides of the model. Thanks.