Weird gaps in terrain (Pregenerated chunks with Chunky)

got DH to work after pregenerating the world (radius 5000) with chunky but some weird things in the chunks (will attach images) , any fixes?

Mods installed: Tectonic, Iris, DH, indium, sodium, fabric api, chunky

My specs: i5-7400, GTX 1050 (2gb vram), 16gb ram (8gb allocated), HDD if it matters
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