Lightmaps on Mobile Devices Appear Dirtied and Pixelated

Baked lighting on mobile has dirtied or pixelated lightmaps. When testing this issue I attempted to change various settings within the 'Lightmass' section and the changes made did not have much effect on the overall rendering quality.

The user reporting the issue claims it was not as bad in 4.7.6, but I was also able to reproduce the issue within the version as well. The suggestions made on a similar post were to change the lightmap resolutions of the static mesh objects, but this did not fix things as expected.

1. Create new Blank BP project and select 'Mobile' for the target hardware, and 'Scalable 2D/3D' quality settings. Include the 'Mobile Starter Content'
2. Use the modular architecture static meshes within the 'Architecture' folder to create an enclosed space.
3. Add a skylight and a few lights to the room and be sure to set their mobility to static or stationary.
4. Build lighting and play in mobile preview.
5. Deploy to mobile device using the 'Launch On' option and notice the differences in baked lighting quality.

Expected: The baked lights and shadows would be similar to that seen in the Mobile Preview.

Outcome: Lightmaps appear dirtied and pixelated.

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