Setting Lightmap Coordinate Index Past 3 Causes Mesh to Get No Lightmap Information

Meshes with their Lightmap Coordinate Index set to anything over 4 will not be lit by static or stationary lighting. 

Found in CL# 4.19 4033788, 4.20 CL# 4369336, 4.21 CL# 4541578, 4.22 CL# 4573698

1. Open Attached project 
2. Load the "Test" map

Results:
The mesh on the left will be lit normally, while the mesh on the right with the Lightmap Coordinate Index set to 4 will be black.

Expected:
Both meshes would be lit normally

Fix UE-51650

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