[bug] Server Freeze on World Generation With "When Dungeons Arise"

[2mal3]

This happens somewhat randomly during world generation, either at the start or while walking around. When you are already in the world, it seems that the entire server logic freezes: no entity AI, no world generation and no item drops. During the initial generation, only the progress indicator stops and nothing else happens. Both mods need to be installed; generating with the seed below works otherwise.

I don't know how easy it is to fix, but I would appreciate it if When Dungeons Arise could be marked as incompatible on Modrinth or in the mod metadata to help others find the issue faster.

To Reproduce

• Install Scriptor Magicae and When Dungeons Arise.
• Generate a new world with the seed 4121065760780861437.
• Watch as the world generation progress freezes and nothing happens.

Logs

There doesn't seem to be any exception or similar in the logs, but here is my excerpt from the time the freeze happens, just in case.

[16:35:22] [Render thread/INFO] [minecraft/RecipeManager]: Loaded 1348 recipes
[16:35:22] [Render thread/ERROR] [minecraft/AdvancementTree]: Couldn't load advancements: [dungeons_arise:find_thornborn_towers, dungeons_arise:find_fishing_hut]
[16:35:22] [Render thread/INFO] [minecraft/AdvancementTree]: Loaded 1444 advancements
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.ace
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.genderqueer
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.lesbian
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.poly
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.trans
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.aro
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.enby
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.pan
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.intersex
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.agender
[16:35:22] [Render thread/INFO] [scriptor/]: Registering custom color scriptor.bi
[16:35:22] [Render thread/INFO] [scriptor/]: Loaded reagent scriptor:amethyst: minecraft:amethyst_shard / 30.0
[16:35:22] [Render thread/INFO] [scriptor/]: Loaded reagent scriptor:gold: minecraft:gold_ingot / 0.0
[16:35:22] [Render thread/INFO] [scriptor/]: Loaded reagent scriptor:redstone: minecraft:redstone / 35.0
[16:35:28] [Server thread/INFO] [minecraft/IntegratedServer]: Starting integrated minecraft server version 1.21.1
[16:35:28] [Server thread/INFO] [minecraft/MinecraftServer]: Generating keypair
[16:35:30] [Server thread/INFO] [minecraft/MinecraftServer]: Preparing start region for dimension minecraft:overworld
[16:35:30] [Render thread/INFO] [minecraft/LoggerChunkProgressListener]: Preparing spawn area: 2%
[16:35:30] [Render thread/INFO] [minecraft/LoggerChunkProgressListener]: Preparing spawn area: 2%
[16:35:31] [Render thread/INFO] [minecraft/LoggerChunkProgressListener]: Preparing spawn area: 40%
[16:35:31] [Worker-Main-9/WARN] [minecraft/AttributeMap]: Ignoring unknown attribute 'forge:entity_gravity'
[16:35:31] [Worker-Main-9/WARN] [minecraft/AttributeMap]: Ignoring unknown attribute 'forge:entity_gravity'

Installed Mods and Loader

• Minecraft 1.21.1
• NeoForge 21.1.244
• When Dungeons Arise 2.1.68 (https://modrinth.com/mod/when-dungeons-arise)
• Scriptor Magicae 2.0.9-1.12.1
• Kotlin for Forge (i guess 5.12.0)
• Unfocused 0.3.3-1.21.1