Missing/Duplicated Chunks

I just got my first PC after way too many years, playing with DH and shaders for the first time, etc. Anyway, I've been trying to get a singleplayer world going, but after two days of troubleshooting, I've arrived here, which is the best result I've achieved so far, but still has two major issues.

First is a band at mid-range that isn't rendering in (but closer and further do). I thought it was a "wait and they'll load" issue, but several hours later and no other chunks loaded in. I saw in the FAQ that Chunky was not recommended, and I have used chunky to generate a 1000 radius circle, but even if I load with my player in survival, it still won't render, and it is always the same chunks that load/don't load. I see that you suggest "DH Internal Server Mode" but I don't really know what that is, or if this is a Chunky/DH issue to begin with, or that can be resolved. (By the way, resetting the world is not a problem since I haven't actually done anything on it yet.)

The second is much stranger, and I haven't seen anything quite like this. At a high enough level, the terrain will vanish, and a second, identical world will appear far below it. It's positioned about -2k below and vanishes as soon as I get close enough to it. I have no idea what is causing that one.

Here is everything that I have on the world/setup to help.
Fabric 1.21 10/32 GB RAM
Iris/Photon shaders (problem persists even without shaders, however)
Larion world generation with WWOO datapack (I've seen videos of both working with DH, so that shouldn't be an issue)
Chunky (saw several tutorials suggesting it, but now perhaps a problem?)
DH (obviously, but only on 2.2.1 because 2.3 doesn't exist for 1.21)
C2ME (latest version for 1.21 but perhaps not helpful with DH 2.2 as per #faq-general?)

Standard performance mods:
dynamic fps
entityculling
fasterrandom
ferritecore
immediatelyfast
noisium
sodium

Various QOL mods, but nothing that should mess with DH afaik. Hope that's helpful. Thx!
Solution
The holes looks like Chunky caused holes
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