Camels work just fine when stepping up 1 block at a time, but they seem to be unable to properly navigate sand layers. When walking on them, the camel will just get stuck and rubber band in place until I dismount.

Mod version: 2.0.3
Forge Version: 14.23.5.2835

Thank you for your report!
Do you have a way to reliably reproduce this?

I tried to, but I started running into a ticking world crash that is preventing me from testing in atum.

When I make a world with only atum and forge the game crashes after about 10-15 seconds of exploration after entering atum. With my full modded instance the game does the same thing, but the world freezes instead of crashing outright.

Crash Log from clean testing instance
Crash Log extracted from game log of full modded instance

I attempted to test the camel movement problem in the overworld, but everything worked just fine. I may have just run into a random error or mod interaction. I'll see what I can do about testing for mod interactions when I have time.

From what I can tell your crash is because of a problem in Forge. Please update to Forge 14.23.5.2836, or any version before 14.23.5.2832.

About the camels - I can't really do much about it, if I can't reproduce it.
Testing for weird mod interactions (When you have time) would be much appreciated :)

Closing as not enough information have been provided about the issue.
If you find a way to reproduce it, please open a new issue :)