Yung's Version: 1.16.4-Forge-12
Server Crash Log: https://pastebin.com/u2XfV9xY
Client Crash Log: https://pastebin.com/k35yvqk5
Latest Log:
latest.log

Unfortuantely, world is no longer playable. Could possibly be because I have the spawn chance cranked up so you have the search for the portals and this may have caused an issue with how they link up? I also have these rifts and monoliths NOT in the nether.

Thanks!

Nevermind, I forgot to add the spawn platform, so it had no clue where to put me. I think. Please confirm that this would indeed cause the problem?

Yeah, that looks to be the problem. It was attempting to placea null block for the spawn platform.