1.21 DH Deletes Multiplayer LODs

Hey y'all. I've been having a blast with DH on other servers w/o problems (although I am struggling a bit with shader support, that isn't my problem today). I recently changed over my server's map to Greenfield v0.5.4, which is a pretty big map, and I got some pretty good exploration of it done with the mod installed. I've logged in and out several times and the LODs were preserved, but for whatever reason today, I log in and now it's like they've all been deleted. I have to now reload all of the map again, like I never loaded those chunks in before. Is there a reason this happened? Is there a limit on what DH can retain in terms of chunks, or something relating to CPU? Most importantly, is there a way to get the LODs I've already discovered back? I'd appreciate any help you can give me.

Attached are before and after pictures showing my dilemma.
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