Evening all, I've done a fair bit of searching through the server to try and find people having similar issues and haven't seen what I believe to be the same problem. I'm running a small modpack but have checked for as many incompatible mods as I can find by searching the server for issues. I've tried both DH 2.4.5-b off Curseforge and the nightly 2.4.6-b, both of these appear to be working fine with Optifine running and no shader pack enabled.
For shaders, I've tried Bliss, Complementary Unbound, and Comp Unbound + Euphoria Patch, and all three have issues when DH is enabled. With DH disabled, all three of these shaders appear to function normally with no issues. I'll include a couple screenshots below to illustrate the issue. Basically, enabling a shader causes the floor directly beneath me to not render properly/become transparent, a bunch of other lightning and rendering issues.
Apologies if I missed something dumb/obvious, I haven't had the Minecraft itch since covid so my mod troubleshooting is pretty rusty.