Shadow Color Not Updated After Light Build When a Texture is Changed and Reimported

Creating a material using a texture (say, blue) and then changing the source file on the texture and reimporting will not update the shadow color after building lighting.

Making changes to the material and applying/saving will correctly update the shadow color after the next build.

See the attached screenshot for an example

1. Open the attached project
2. Open the blue texture
3. Change the Source File to the Red texture
4. Reimport & Save
5. Build lighting

Result: The shadow is not updated to reflect the change in color of the material

Expected: The shadow would match the color of the re-imported texture