Emissive for Static Lighting discarded upon Re-opening Level or Restarting Project

'Emissive for Static Lighting' discarded when restarting or re-opening a project. I discovered this issue while testing [Link Removed].

This issue does not occur in the binary 4.11 release so I have marked this as a regression.

1. Create new blank project.
2. Delete everything but the 'Floor' actor in default level.
3. Drag a Sphere into the scene
4. With the Sphere selected, enable the 'Emissive for Static Lighting' setting.
5. Create a new material using the image as reference.
6. Apply material instance to the Sphere.
7. Build All.
8. Re-open Level or Restart project.

Outcome Emissive Static Lighting is discarded, and I cannot find a way to get it back.

Expected The emissive static lighting persists no matter how many restarts or re-opens of the level.

Fix UE-51650

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