SceneColor in surface material ignores translucent objects

Translucent meshes and particles behind an actor who's surface material uses SceneColor node are not rendered properly. Changing the view angle of the camera causes the translucent meshes to "pop" in and out of view. (see attached video)

This affects 4.17.1 and the 4.18 Preview

Regression:
Yes - Translucent meshes were always visible behind object with SceneColor material in 4.16.3 (CL 3561208)

1. Open UE4 editor (first person template project)
2. Add new material with settings shown in screenshot
3. Apply material to any white cube in the viewport
4. Reposition cube so it is over the "First Person Template" text on the floor
5. Fly camera around, looking at the text through the cube

Result:
Depending on angle / distance, the text behind the box will vanish

Expected:
Text is always visible though the cube

Fix UE-51650

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