Can I ask how you are getting the reflections to work?
With r.VXGI.SpecularTracingEnable disabled, I get screenspace reflections - but that only works for high gloss surfaces.
With r.VXGI.SpecularTracingEnable on, I find that reflective surfaces will only reflect direct light:
https://dl.dropboxusercontent/u/247271563/vxgi_reflection.jpg
All attempts to use reflection captures or environment maps with specular tracing just gave me completely black reflections…