Source image of the referenced material doesn't change when the reference object (or parent) visibility is false by default.

1. Download and run test application
2. Press "2"
Note: Change the source of reference material to b.png

EXPECTED RESULT
After step 2: The diffuse map will be changed to b.png

ACTUAL RESULT
After step 3: The diffuse map is a.png

Recovery method:
Press "3" (Change the visibility of the reference element to true)

The workaround where we will set the visibility "true" by default cannot be applied in our project because of there is a complex structure

Tested on 2.6 and master (Id1ddbf51922d9e9d68662d72bd5ba0906fe0b17c) branches