Unity collision while rescaling

Question

What I am trying is to make an object being rescaled only from the top.

Here is what I have done using the gameobject parent method I got from here : https://stackoverflow.com/a/39217454/4322337

It is working just fine as we can see below: But after adding a rigidbody and applying gravity to the parent gameobject, I run into this issue :

why my gameobject go through the ground collider, yet when I look at my object collider, everything seems be ok?

I have also attached my sample project for people who would like to see by themself http://www.filedropper.com/testground

Answer 1

This is what happens in my Unity (2017.3.0f3) after I have pressed space for a while. The object with the rigidbody component does not pass throw the terrain.

Is this how it should work? If yes either downgrade or post a bug report with your sample project.