Crash Report:
crash-2021-06-17_22.37.37-server.txt

Crash Log:
2021-06-17-3.log

Happens when loading a world that was just created

Try with this: https://www.curseforge.com/minecraft/mc-mods/crafting-dead-immerse/files/3355284

Sadly, it still happens even when removing some mods

Crash Report:
crash-2021-06-18_18.51.43-server.txt

Crash Log:
latest.log

Fixed

Just released 1.7 which fixes this.