If a render-tile is only touched by chunks with blocks at the highest point near the sky, then the render tile may not be rendered due to the chunk scan's algorithm. Chunks in rows divisible by 4 were not considering the tile above them, even though the chunk partially overlaps. This is only seen for chunks with blocks at the very top of them by the sky, and only when no other chunks would trigger that tile for rendering.
51 KiB
51 KiB