Created GameObject child gets the same attributes as parent.

Recently there's something which looks brand new in unity and at the same time annoying. Each time I create or add a new child to a gameObject it gets the same shape as their parent by default.

As seen here, the ground shape is a plane and the obstacle's shape is a cube. When I place the cube on the same hierarchy as the plane, the cube gets shaped into a plane itself, but keeping the same attributes as a newly placed object.

https://imgur.com/a/cVLRZsr

Is there a way to remove this?