Steps to reproduce: 1. Craft "Handy Bag (Large)" from "Ender Utilities" 2. click E to open inventory. 3. Kick from server with message: Connection Lost, a fatal error has occured, this connection is terminated From logs: I searched for this issue and found: Tried to read NBT tag that was too big - Minecraft 1.12.2 Modded Server - Java Edition Support - Support - Minecraft Forum - Minecraft Forum They advise to test with mod: https://www.curseforge.com/minecraft/mc-mods/bigger-packets-please Currently trying to test with it.
As issue not apply to my friend i investigate more. It seems that it is connected to Portable Grid from Refined Storage - if i put it out of my eq the Handy Bag (Large) stop causing issue.
Thank you for the detective work! An @Administrator will need to decide if we can put that mod (Bigger Packets Please) on the allowed whitelist.
I couldn't reproduce this error and your bag worked fine for me, but I suspect it may be related to some of your memory cards being private and some public. I removed the public ones and put them in your inventory. Let me know if you still have issues or not.