Operating system: Ubuntu 18.04
Graphics card: GTX 970
Broken: 2.80.45, Date: 2019-02-21 10:59, Hash: 1bfbfa281046
Short description of error
When I try to preview an Object in Local View with Cycles, all my objects are rendered together. It seems that Cycles ignores Local View.
Exact steps for others to reproduce the error
Select the Cube and duplicate it.
With your selected Cube, press '/' to enter in Local View.
Set Cycles as Render Engine.
Set 'Rendered' as 3D View display method.
Blender should normally only preview your selected Cube. However it preview both.
Here is the .blend file:
And a screenshot: