SceneTexture:Scene Color node renders black in Standalone, Launch On and Packaged Game

When using a Blendable to render SceneTexture:Scene Color into the Post Process, it appears to render as expected in PIE and Simulate, but when viewed in Standalone, Launch On or a Packaged Game the Blendable only renders Black.

Also Reproduced in Main Promotable-CL-2575140 and 4.8 Preview 4 (Launcher)

Quick Reproduction, open Attached AH_SceneColorTest Project

1. Open a New Blank Project with no starter content
2. Create a New Post Process Material
3. Add a SceneTexture:SceneColor node into Emissive
4. Place an Unbound Post Process Volume in the level
5. Assign the Post Process Material to the Blendable section of Volume
6. Play in Standalone Game Mode or Launch On

RESULTS: Screen appears completely Black

EXPECTED: Screen should appear as it does in editor.

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