I saw the note on the Curse download site, but I don't have an account there and I would like to watch this issue and possibly test if you ever decided to try and tackle it more. I don't have any experience with shader development, but I did try to comment out some different things but nothing popped up.
An online search didn't come up with much but this video about fixing a similar issue with composite1
https://www.youtube.com/watch?v=fIzuz3AM27Y

If you would rather not have a ticket to track this open, please feel free to close it.