Made our Server crash by placing a crystal shulker from the "Iron Chest" mod, taking out a backpack and the try of placing it back into the shulker after taking out item from the backpack, server crashed and shulker disapeared.
To Reproduce:
Install Improved Backpacks
Install Iron Chest 7.0.67 build 844
Expected behavior:
to not crash
Screenshots (If applicable):
X
Additional information:
Minecraft version: 1.12.2
Forge version: 14.23.5.2854
Mod version: 1.12.2-1.5.0.0
socolio
commented
3 years ago 
Description:
Made our Server crash by placing a crystal shulker from the "Iron Chest" mod, taking out a backpack and the try of placing it back into the shulker after taking out item from the backpack, server crashed and shulker disapeared.
To Reproduce:
Expected behavior:
to not crash
Screenshots (If applicable):
X
Additional information:
Minecraft version: 1.12.2 Forge version: 14.23.5.2854 Mod version: 1.12.2-1.5.0.0