The crash occurs randomly when exploring the world, seemingly when this mod tries to place a structure/feature. Don't really know what else could be causing the problem from what I can find in the crash logs.

crash-2021-02-24_16.59.55-server.txt

Closing due to inactivity. May be fixed now anyway. Please open a new issue (with more details!) if the issue persists.

Try running the game with Blame installed and then pastebin the new crash report.

Blame: https://www.curseforge.com/minecraft/mc-mods/blame