Issue description:

With over 3 million (estimated) items in storage, server disconnects when item grid is accessed.

What happens:

Screen becomes grey, then disconnects with the message "Payload may not be larger than 1048576 bytes"

What you expected to happen:

Opening item grid works as normal

Steps to reproduce:

1. Have over 3 millions items in storage system (estimated)
2. Attempt to access item/crafting grid

Modpack: All The Mods 6

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.16.5

• Forge: 36.1.2

• Refined Storage: 1.9.12

• Extra disks: 1.5.0

Does this issue occur on a server? [yes/no]
Yes

If a (crash)log is relevant for this issue, link it here:

latest.log

Using multiple disks from refined storage or a single disk from extra storage does not appear to make a difference.

Do you have multiple disks? If yes, remove a few ones. And delete items with much nbt data such as different damaged armors and enchanted things. Consider using a filter system to remove them instantly or don't let them in the system.
I can't fix this because it's a vanilla limitation. I hope this fix it for you.