Steps to reproduce:
1. Open the project
2. Enter play mode
3. Wait for a couple of seconds and exit play mode
4. Notice the console's filled with errors "Can't destroy Transform component of <object>. If you want to destroy the game object, please call 'Destroy' on the game object instead. Destroying the transform component is not allowed."
5. Create an empty GameObject in the Hierarchy window
6. Drag the "GameObject" to "Stress Test" gameobject -> "Stress Test (Script)" -> "Container" field
7. Repeat steps 2-3
8. Notice errors changed to "Cannot change GameObject hierarchy while activating or deactivating the parent.
UnityEngine.Transform:SetParent(Transform)"

Expected: In both cases the error "Cannot change GameObject hierarchy while activating or deactivating the parent." is displayed, as the actions performed are the same
Actual: Errors differ depending on whether a parent container is set.

Reproduced on: 5.5.0p3, 5.6.0b3
Unable to reproduce on: 5.4.4f1