LODs not rendering upon re-joining a server

DH working perfectly during a session on my modded server, but after disconnecting + rejoining, they do not render and I have to revisit all the chunks again.
  • Forge 1.16.5
  • Modpack includes Immersive Engineering, Immersive Railroading, Custom NPCs
  • Using Optifine (still doesn't work when disabling shaders)
  • Forge server hosted w/ Shockbyte, ~4G RAM
  • Checked and LODs are saving to correct location as specified in faq
Solution
Downgraded to DH version 1.6.5a and it works with Optifine.
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