Image Effect shows black screen. Lightmode=meta pass issue.

With a new fresh clean project in unity 5.5.2p1 I created a new image effect based using your template.

Camera is forward and depth rendering is enabled through script.

The camera onrenderimage just does a simple blit with the material using the created shader.

When I run, it shows a black screen. When removing the LightMode meta pass from the shader source it runs as expected and shows the solid color.