[Vuforia] AR camera configuration file changes are not saved

When making changes to configuration file of AR camera, for Image Database, the changes do not persist even after saving the project and the scene.

Steps To Reproduce:
Open the attached project , and add a new Image Target via Hierarchy or Game Object windows.
Open the AR camera configuration
Observe the changes to image database being Lost.

Frequency:
Always

Expected Result:
Changes made and saved to configuration file persists

Actual Result:
Changes do not persist

Occurring versions : 2017.2.f3 , 2017.3.0b9 (Previous versions do not have vuforia extension as part of the editor)

Platform : Windows 10, 8.1 , MacOS 10.12.6