Deformation of child object

Hello. I didn’t find the right forum for posting about this issue. Problem: child object deforms when rotating.
To reproduce:

  1. Open unity

  2. Create new scene

  3. Create new empty object (picture 1)

  4. Set it size to (1, 2, 1) (picture 2)

  5. Create new cube

  6. Put it into empty GameObject (picture 3)

  7. Rotate child object (picture 4)

How to fix it?

There’s no real ‘fix’ for this. Avoid doing non uniform scales.