[1.16.5] Failed to schedule load callback for chunk

[Nebula240]

Minecraft Version : 1.16.5

Mist Version : Mist version 1.16.5-33 (MC: 1.16.5) (Implementing API version 1.16.5-R0.1-SNAPSHOT) false

Operating System : Linux (amd64) version 5.4.0-81-generic

Concerned mod / plugin : https://www.curseforge.com/minecraft/mc-mods/dungeons-mod

Logs : https://paste.ubuntu.com/p/5v5WX7n2BF/

Steps to Reproduce :

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Description of issue : Give all details about your issue
The server is crashing when players encounter or when the server is trying to spawn guards.