This mod causes a glitch with shaders (using oculus) this glitch happens only around evening as far as i can tell, regardless if you have a block from the mod in the world or not. everything just gets cut off.

Can confirm I am experiencing this issue as well. Managed to track it down because of the hard work of another minecrafter, but wanted to report more details from my end. Namely that not only does half of the world often get cut off at sunrise and sunset, but at various times throughout the day and night, I will see the sun and moon through solid blocks, underground, etc. So there's something odd going on with how this mod affects shader rendering. Hopefully this report helps!

I have experienced the same problem and only just confirmed it was Block of Sky. It happens during transitions between morning and evening. I also noticed that the sun and moon are constantly visible while using several shaders as well, complementary in particular, visible through any number of blocks no matter how far or thick.