Send invalid nbt of some mod item through chatbox can cause client crash

[zyxkad]

Describe

Some mod will add tooltip in their items, and some of the tooltip may depends on a strict NBT parser, which means if you sending an invalid item with the show_item action through chatbox, client can crash when they hovering on the chat.

Steps to reproduce

1. Install Sophisticated Backpacks mod, as well as AP and CC:T
2. With a chatbox, run

   peripheral.find('chatBox').sendFormattedMessage(textutils.serialiseJSON({
   	text = 'Hover this to crash your client',
   	hoverEvent = {
   		action = 'show_item',
   		contents = {
   			id = 'sophisticatedbackpacks:backpack',
   			tag = textutils.serialiseJSON({contentsUuid={0,0,0,0}}, { nbt_style=true }),
   		},
   	},
   }))

3. Hover on the text
4. The game will crash

Multiplayer?

No

Version

1.20.1-0.7.38r

Minecraft, Forge and maybe other related mods versions

Minecraft 1.20.1, Forge 47.2.0, sophisticatedbackpacks-1.20.1-3.20.5

Screenshots or Videos

No response

Crashlog/log

No response

[zyxkad]

The real issue is CC:T is serializing {0,0,0,0} as a NBT Tag List [0,0,0,0], but it should be serialized as NBT Integer List [I;0,0,0,0]

[zyxkad]

AP probably can detect if a message will crash the client before sending it, if is then reject the message sending

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or replace the show_item with an error message will be better