Question Weird behavior on default Lit shader

My projects are having this weird issue where my objects have holes in them as if the back face were showing in front of the front face.

It happens when I set the surface type to Transparent and Render Face to Both.

I've set the ambient color to yellow so you can see what is happening more easily.

I'm using the default meshes and the default Lit shader.

 

This has been destroying my project, no one has an idea of what could it be? I have a lot of transparent objects using both render faces.