Versions

Betweenlands version:

3.3.8

Forge version:

14.23.3.2655

Singleplayer or Multiplayer:

Server, Forge

Installed mods:

Betweenlands only.

Link to full crash log

https://pastebin.com/6dt2EPdy

Description of the problem

How to reproduce:

1. Give yourself OP
2. Create Portal Tree, walk through the portal
3. Game frozen, server died on trying to generate dimension

Expected result:

See new dimension with mod content

Actual result:

Crash.

I ran into a similar issue, preventing a dedicated server from even starting-
https://gist.github.com/falkreon/cc5bf25e9fdd2f2d37cfa2dafabec85c
We seemed to be fine running Forge 14.23.4.2702, but when we updated to 2703 it died.