Steps to reproduce:
1. Open user attached project
2. Play the scene
3. Select the EventSystem and observe the output
4. Select the Game window
5. As you hover over the object you see game object "Incident" listed in the event system
6. Hit "down" arrow key to scale the object down and turn it off
7. Hit "up" arrow to turn it back on and scale it back up
8. Observe that the event system does not find it until you hover over almost the very bottom of the "Incident" game object

Expected result: Physics Raycaster should detect the full object's collision bounds after an object was scaled down and disabled
Workaround: toggle the box collider off and back on after

Reproduced in: 2018.3.0a6, 2018.2.1f1, 2018.1.9f1, 2018.1.5f1
Not reproduced in: 2018.1.4f1, 2017.4.7f1
Regression since: 2018.1.5f1