Steps to reproduce:

1. Download and open the attached project
2. Observe the scene's gameobjects in the Game view

Expected result: objects in front rendered normally
Actual result: object behind's stencil state leaks

Reproduced on 5.6.4p1, 2017.1.2p1, 2017.2.0p1, 2017.3.0b8, 2018.1.0a3

Notes:
- Workaround provided: checking the "Do stencil workaround" on the camera's attached script solves the issue by forcing an additional object to be rendered in the command buffer using a shader that sets stencil back to a default state.