Monitor Directories does not prompt for re-import if change is made

In the 4.16 Binary build When making changes to an asset that is set up for auto import, or in a folder that is a Content Monitored directory, changes made do not get detected by the engine.

Regression:
This issue is not occurring in the 4.15.3 binary build of the engine

1. Create a new folder that is not located within a project and add an Image file to that folder
2. Create a new project (No template or starter content needed)
3. In the Editor preferences Under Loading and saving expand the "Monitor Content Directories"
4. Add the folder you made to the array
5. Import the image in the external folder into the engine
6. Make a change to that image and re-save it
   Result: The editor does not attempt to re-import the image
   Expected Result: The editor notifies user of the change and allows the option to re-import