Mod list attached.
I've tested this on two systems:
AMD Ryzen 7 5700X3D/9070 XT
Intel Core i5-8265U/Intel UHD Graphics 620
Server: AMD Ryzen 7 5700X
I've confirmed this issue to be with 2.3.5b and above. When I downgrade to 2.3.4b, everything starts rendering fine again.
DH stuff renders on these systems fine in singleplayer, but whenever I go to play on my server, I get just... void - it's either fully black with only particles and HUD elements rendering, or it's the sky with no elements.
When I use Oculus on my 9070 XT system, LODs still aren't visible. More interestingly, when I fly up high enough to see shader clouds, they become invisible in sections that LODs should be rendered in.
I'm going to send a pic from my i5-8265U system afterwards, because that has just the sky problem. The i5-8265U system had a clean instance, the 9070XT desktop did not.
I've wiped the 42.6GB sqlite from the server and let the server regenerate LODs with ZSTD. Wiped the DH chunks from my system too, still, nothing happened.
There are NO DH-related errors in the log, making this even more confusing.