BUG - Multiple cameras using render texture, only first camera renders lighting

I'm working on a split-screen game which uses a single RenderTexture to render all of the cameras in the scene. The problem is that only one of the cameras is capable of rendering lights. I am using 5.6.0p3.

I found it on the tracker here but it seems pretty dead.

Any Unity devs working on this issue?

 

I've looked into this more, and it actually does not matter how many cameras are using the Render Texture. This issue is related to the camera's viewport rect position.

Point lights are not rendered if the viewport rect X position is too high. The cutoff point is about 0.35. See image:





If the viewport rect X position is 0.5 or more, the light is not rendered at all.

 

This is fixed in Unity 2017.1.0p2