Version:
TerraFirmaCraft 3.2.11
Create 0.5.1-j

The procedure to reproduce:

1. Create a world

2. Opening a Create's ponder screen which has mobs:
   

I used Deployer, and it worked well in clear weather.

3. Using command to set the weather to rain

4. Repeat step 2, the game will crash after this moment:
   

Crash Report:
crash-2024-12-07_17.25.28-client.txt

6594bc5