When I use the voxel render method, the terrain does not actually render beyond what I have the render distance set to. Heightmap seems to work fine if I give it priority, but then everything looks ugly up close. It seems to me that the heightmap is supposed to render under the voxel at a distance but does not, although this could be a settings issue. If you need me to post my PC specs I'll go ahead
Version: Forge 1.12.2 - 14.23.5.2860 (16GB RAM allocated)
Mod List:
Far Planes Two - 0.0.1.728
Forge Rocks - 6.28.2
OptiFine - HD U G5
Cubic Chunks - 0.0.1208.0-SNAPSHOT-all
Cubic World Gen - 0.0.152.0-SNAPSHOT-al

Heightmap priority

Voxel priority

apparently the solution to this is to turn off shaders (optifine) to internal

It's a pity but maybe it will be solved in the future

i have the same probleme

same issue