[Substances] Exporting the bitmap with remapped alpha causes rendering issues in the material after export

- Launch the attached project
- Load the scene
- Select the bricks substance and from the inspector click on export bitmap with remapped alpha channels
- After exporting, if we toggle between applications such that unity editor loses focus and comes back

Note that the substance rendering gets corrupted.

Workaround: is to reset the material using the menu in the inspector.