When merging an object with multiple colours to other actors a small portion of the colours are lost

When merging an object with multiple colours to other actors a small portion of the colours are lost.

Note this only occurs when merging to multiple actors and only seems to happen for the diffuse.

1. compile and open QA game
2. Load TM-MeshBakeMap
3. Navigate to display 3.C
4. Select all the actors behind the display
5. Open the merge actors window (window>developers tool>Mere Actors>
6. Set Lodselection to use specificLodlevel
7. Enable Material merge
8. Press merge actors and save the object
9. Open the texture sheet of the new actor
   Result
   A small section of pink isn't merged correctly and is missing from the rainbow