Steps to reproduce:
1. Open the attached project (ShaderPassesWithCameraDepth.zip)
2. Open the Fog of War/Examples/1. Image Effect/Example 1.unity scene
3. Run Unity
4. Observe that everything is dark and changes brightness when rotating the camera

Expected result: The fog should be generated around game object
Actual result: Everything is dark and changes brightness when rotating the camera

Note: Assets>Fog of War>FOW>FOWImageEffect.cs at line 42 (mCam.depthTextureMode = DepthTextureMode.Depth;) does generate a depth texture

Reproduced with: 5.5.0a1, 5.5.0b9, 5.5.0b11
Not reproduced with: 5.3.6p4, 5.4.2p3
Regression introduced in 5.5.0a1