massive problems with LOD chunks loading

they keep doing this sort of thing, super patchy monoliths in the distance. fully loaded sections don't even stay loaded all the time, they'll just dissapear
Singleplayer world, version 1.21
Mod list:
Distant Horizons 2.1.2-a
Fabric API 0.100.2+ 1.21
Indium 1.0.33+mc1.21
Iris 1.7.1+mc1.21
Sodium 0.5.9+mc1.21