System Information
Operating system: Windows 7
Graphics card: NVIDIA GTX780

Blender Version
Broken: 2.8 RC2
Worked: 2.79

Short description of error
Isolate button / doesn't work in cycles render mode

Exact steps for others to reproduce the error
Open blender. Add a cube and a plane. Go to cycles mode render. In viewport, switch to render (Z8), select the cube, push / button (isolate), the cube and the plane are visible both.
Thank you!