Weird flying layer in caves / rendering issue (?)

As on the video, I see a huge flying layer of blocks that uhm, shouldn't exist? I don't experience that on surface, just when in large caves, somewhere underground. I'm not sure if I changed something in DH settings (I don't think so though) or is it a bug, please advise. Also not sure if it's an expected behavior or fixable at all, I am sorry if it's a repost, tried searching by keywords on this forum and couldn't find anyone with similar graphical issue.

Minecraft version: 1.19.2 (multiplayer server)

PC specs (I don't think it matters but including it anyway if needed):


All mods that I use:


This modification is awesome, I'd like to donate a few bucks as a way to thank for this mod, it's a game-changing feature that persuaded me to play Minecraft again!
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