Steps to reproduce:

1. Open "OnTransformChildrenChange.zip" project
2. Open scene "UIChildChangeEventProblem"
3. Notice that GameObject "NormalTransform" has "OnChildAddedRemovedScript" attached. This script only has OnTransformChildrenChanged
4. Run this scene and notice that "TestObjectHolder" is created
5. Make sure that "Destroy object" is disabled
6. Click "Add Child To Transform" button and notice that OnTransformChildrenChanged is successfully called
7. Click "Remove Child From Transform" and notice that child is taken from "NormalTransform" and assigned to "TestObjectHolder" but OnTransformChildrenChanged doesn't get called

Note: If we enable "Destroy object" and, after clicking "Add Child To Transform", click "Remove Child From Transform", then OnTransformChildrenChanged will get called.