No Optifine?
Optifine is very buggy with many mods. This modpack have OCULUS / RUBIDIUM - a light version of OP, it also support shaders and dynamic lights.
I don't want seasons changing
You can turn it off by ingame command "/gamerule doSeasonCycle false" Or you can customize it in your worldFolder/serverconfig/sereneseasons-server.toml