Lines appear between blocks at a certain distance from the player. images provided are both brand new worlds.

This looks like a GPU rendering issue; I've had this issue occur before. Are you running on AMD or Nvidia? Is this also reproducible without Astral Sorcery installed?

@kalkafox Running Nvidia. and it is in vanilla too. its been a while since i played 1.15.2 in general so i must've forgotten. Closing.