Describe the bug

i wrote a letter, item attached doesnt matter, corrupts playerdatat when picked up and kicks you from the server when you render it

[01Aug2025 01:44:27.942] [Render thread/ERROR] [net.minecraft.world.item.ItemStack/]: Tried to load invalid item: 'Item must not be minecraft:air'
The letter:

To the Esteemed SaunHardy,

I hope this letter finds you in excellent health and high spirits.

Permit me to introduce myself—though I suspect my name may already be faintly familiar to you—as SteelofGame44, a devoted participant in the wondrous realm we so fondly share. It is with the utmost respect, admiration, and no small measure of humility that I write to you today.

With a heart stirred by creative ambition and a mind captivated by mechanical ingenuity, I have long found myself enthralled by the elegant intricacies of the Create Mod. It is a marvel beyond compare—a testament to both beauty and function in perfect harmony.

In this spirit of invention, I write to make a respectful inquiry: might you consider bestowing upon me the extraordinary boon of a Creative Motor?

I am, of course, fully aware of the singular nature and potential for imbalance that such a mechanism may represent. I assure you that my intentions are guided solely by a sincere desire to explore and experiment—to construct, not to dominate; to imagine, not to exploit.

Should you find it within your heart (and server policy) to grant such a gesture, it would be received not merely as a gift, but as an emblem of trust—one I would endeavor to honor with integrity and restraint.

Regardless of your decision, I remain grateful for your stewardship and the thoughtful care you bring to our shared world. It is a rare delight to be part of such a vibrant and imaginative community.

With the highest regard and sincerest thanks,

SteelofGame44
Inventor, Tinkerer, and Humble Aspirant
August 1st, 2025

To Reproduce

sent the above described letter to someone

Expected behavior

letter arrives displaying the message

Mod Version

1.0.16

Minecraft Version

1.21.1

Modloader

neoforge

Crash Log (if applicable)

[01Aug2025 01:44:27.941] [Render thread/ERROR] [net.minecraft.world.item.ItemStack/]: Tried to load invalid item: 'Item must not be minecraft:air'

Additional context

No response

why did u write an useless letter with AI... atleast write it by yourself...

why did u write an useless letter with AI... atleast write it by yourself...

@VaporeonScripts Your contribution to this issue is overly relevant...... No hate, just found you fonny

also, to actually help with the issue, @notNeurod , please, actually send the logs, that small part of logs means absolutely nothing, it could be 1000 things.

also, to actually help with the issue, @notNeurod , please, actually send the logs, that small part of logs means absolutely nothing, it could be 1000 things.

that is the only log relevant to mr crayfishs mod in the timeframe the chunkban appears, it is repeated like 20000 times. it is definetly relevant to the issue

does it happen with only this mod enabled?

its on a server with 300 other mods and the crash occured with this one, you are free to go through the other 299 yourself

well, that's not how it works xD (you should debug it ngl), since its almost certainly a mod incompat/some other type issue caused by multiple stuff, you should try running the game with only performance mods and that mod, to see if its caused by that mod, if no, then its clearly an incompat/error made by other mods that could interact with this mod