I have a modded server with few mods. Server has Mohist and Bukkit. It works fine in singleplayer. But in the server when we load/tp to the primortal caves or toxic caves server crashes. Also i tried to go to the magnetic caves It only replaces stone to galen. World gen remains like vanilla. It spawns mineshafts in the cave and such. I dont Think any mods are the issue still gonna give the full mods that we are using:
Security craft v1.9.8
alexscaves-1.1.4
athena-forge 3.1.1
chipped-forge 3.0.0
citedel 2.5.6
cosmeticarmorreworked-1.20.1
DiagonalFences-v8.0.1
DustrialDecor-1.3.5
embeddium-0.3.25
FarmersDelight-1.2.3
fruitdelight
fusion-1.0.5
geckolib-4.4.2
inventorypets2.0.23
MaFgLib-0.1.2
moonlight2.12.9
MyNethersDelight-0.1.7.5
PuzzlesLib-v8.0.15
rechiseled-1.1.2a
resourcefullib2.1.21
skinlayers3d-1.6.2
sophisticatedbackpacks-3.18.56.890
sophisticatedcore-0.5.82.383
supplementaries-2.8.17
XaerosWorldMap_1.37.8

Also heres the log files
latest.log
debug.log

pretty sure its cuz of Mohist and Bukkit. Let me know any other information required for the crash