Chunk occlusion culling can mistakenly determine that chunks are invisible and leave visual holes in the world. Attached is a screenshot and a world save specifically crafted to make these holes easy to find-- simply fly around in vanilla.
If the holes are due to the heuristic culling as detailed in the “Advanced Cave Culling” blog, consider implementing either Douira’s Divider or Fast Frustum Clamping as described here: https://cod.ifies.com/voxel-visibility/
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We're tracking this issue in MC-300321, so this ticket is being resolved and linked as a duplicate.
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