Multiverse overworld & DH 2.3.3-b cause disconnect from server

Fabric 1.21.1 latest Distant Horizons 2.3.3-b on client and server Hybrid server software (Arclight) latest dev build Multiverse Core 5.0.2 I've been running hybrid servers with Arclight for over 6 years now, and never encountered a problem like this until I tried incorporating Distant Horizons onto the server. I have a void world that has some floating islands which serve as my server spawn. The world is called "spawn". When I copy the region files (or even copy/paste the island itself into a fresh void world) from the spawn world on the last server (no DH) to this new testing server (DH), I run in to the following problem. I attempt to join the world, and it usually works once, although I get the attached error in chat. Subsequent attempts to join the world result in me getting immediately disconnected with an "Invalid Player Data" error, and the below error in my console. Here is the full server log: https://hastebin.com/share/reboqupaja.makefile No amount of painstaking troubleshooting on my end has been successful in terms of resolving this issue, and I would be extremely grateful for any advice. Thank you.

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