I've been trying to make a server with about 35 mods for a few days now, but I've always encountered the issues crashes in the title. They only (sometimes) happen when the server is generating new terrain but they are pretty frequent. The server itself runs fine.
Here are three of my crash logs:
https://cdn.discordapp.com/attachments/816681294154301471/983716906802491432/crash-2022-06-06_11.22.59-server.txt
https://cdn.discordapp.com/attachments/816681294154301471/983716932526157834/crash-2022-06-06_13.10.43-server.txt
https://cdn.discordapp.com/attachments/816681294154301471/983716967464710175/crash-2022-06-06_13.19.09-server.txt