PBL ambient diffuse and reflection incorrect - Unity 5.5 SF 1.33

Are you sure the SF shader is set up correctly? I can't reproduce this on my end

It is a new Lit(PBR) shader, unedited.

Yep, same here

What skybox are you using? The default?

I ask this as the issue isn't noticeable with the default skybox / or skyboxes with low contrast.