SRP Repo: Issue #1454

When using multiple camera and setting Viewport Rect, this problem will occur.

Setup a scene like a following:

1st Camera
Depth: 0
ViewportRect: 0, 0, 0.5, 1(x,y,w,h)
2nd Camera
Depth: 1
ViewportRect: 0.5, 0, 0.5, 1
1st Canvas
RenderMode: Screen Space - Camera
Camera
Depth: 2
ClearFlags: DepthOnly
ViewportRect: 0, 0, 0.5, 1
2nd Canvas and Canvas Camera
RenderMode: Screen Space - Camera
Camera
Depth: 3
ClearFlags: DepthOnly
ViewportRect: 0.5, 0, 0.5, 1
I think, it expects that 1st camera and canvas has rendered left side of screen and 2nd staff has renderied right side of screen.

If not using LWRP gets correct result.