LODs are weirder on server+client than client alone

We're on 1.20.1 running a modlist of rather ridiculous length (which I can dump here if you really want). I've been playing with DH installed to my client for a while, and my friends were impressed enough they wanted it on the server as well to render further. They ran a pregen cycle overnight, and now the LODs have these big pillars that weren't there before and definitely aren't part of the chunk. (I only have the 'after' screenshots; apologies.)

I've looked at other threads in this forum and forcing the server to regenerate the LODs for specific chunks appears to be a rather involved process. Is there a way to instead ignore whatever the server sends me in favor of what my client has already generated?
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