This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
When you place a Mesh with a Translucent Material using Separate Translucency in the view of a Scene Capture 2D using Gaussian DoF, the resultant capture will ignore the Separate Translucency Setting.
Attached Project in Description for quick repro.
RESULTS: The RenderTarget renders with complete DOF
EXPECTED: The RenderTarget renders everything with DOF but the Cube.
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