To reproduce:
1. Create new project.
2. Create new "Plane" in the scene at (0,0,0).
3. Select Camera, and set it's "Clear flags" to "Depth only", "Rendering Path" to "Deferred", and make sure that "Allow HDR" is checked.

Expected result: Only the existing plane is visible.
Actual result: Objects has it's vertical reflection on other side of the screen.

Reproducible: 5.6.0a2, 5.6.0f3, 2017.1.0a5
Not reproducible: 5.5.3p1

Fixed in: 2017.1.0a6

Details:
Also affects build version.