Was using the Atlatitans Terraforming ability for a long while in a Plains biome, wasn't having any issues at all with it. Then as soon as I got close to a few trees in a Forest biome and used the Atlatitans ability, the server crashed and cause a softlock, so no one could get in at all, forcing us to use a world backup. I couldn't seem to be able to recreate the issue in Singleplayer however, so I'm guessing it might be a Multiplayer issue or something.

Here's the Crash Log for when it happened:
crash-2024-02-21_23.17.55-server.txt

Here's another Crash Log for when we attempted to log back in after the issue happened:
crash-2024-02-21_23.20.24-server.txt

Minecraft Version: 1.20.1
Forge Version: 47.2.0
Alex's Caves Version: 1.1.0
Citadel Version: 2.5.3-1.20.1

Here's a modlist for the modpack as well if it helps out:
modlist.txt

As I posted this, I went back into my friends mc server to the spot I crashed at when using the Atlatitan ability, and I noticed a Rat Hole from Rats in one of the tree trunks, so I went into a Singleplayer world to see if the Rat Hole was the issue, and turns out, it was, got the exact same crash in SIngleplayer.

Here's the Crash Log for it:
crash-2024-02-22_13.48.12-server.txt