Ah, sorry, somehow missed that you replied to this.
I'm pretty sure I've only seen it occur when the assets for jump points are first loaded in, and then only rarely. This particular screenshot was from starting the program and then starting a new game. I was able to pause the game when I noticed the bug so that I could get a good screenshot. As soon as I unpaused the rays rapidly retreated to where they are supposed to be.
I haven't noticed a pattern to when it appears, but I haven't tested either.
It may be caused by ShaderLib, but I'm fairly sure I've seen it even when I didn't have any mods installed.