Lumen causing exposure issues when several viewports are opened

1. Unzip, load the project: [Link Removed]
2. Open the level ./darkening_demo/Content/Levels/L_darkening_test.umap
3. You should get a layout with 3 viewport panes with the project, if not please use a 3-pane layout preset.
4. Set top-left viewport camera to CineCameraActor0, top-right to CineCameraActor1, and bottom to CineCameraActor2.
5. Middle-click the top viewports to change focus between top-left and top-right viewports.
6. Notice the change in brightness of the inactive top viewports. (the active one should be normal, and the inactive one should be noticeably darker).
7. Set the CineCameraActor2 XY and Z transforms to 0
8. Repeat step 5 and notice there is no darkening of the inactive viewport any longer.

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