How to fix NBT tag errors

If you encountered the error Tried to read NBT tag that was too big; tried to allocate: 2097159 bytes where max allowed: 2097152, then you need to know how to fix it!

The chunk causing the crash contains a block with too much NBT data. This is usually caused by the fact that your Minecraft server has made a crash item. For example, a crash book chunker.

You need to download the Panilla plugin - Prevent hacked items.

Panilla is a plugin for Minecraft servers to prevent abusive NBT (AKA hacked items) and harmful packets. Great for large creative-mode servers!

Supported on 1.8.8, 1.12.x-1.20.x!

With this plugin, you will be able to prevent:

Unobtainable Enchantments (eg. Sharpness X)
Unobtainable Potions (eg. Insta-kill or troll potions)
Unobtainable Fireworks
Client crash Books/"Ban Books"
Client crash Signs
Client crash Chests/Shulker Boxes
Client crash Potions (invalid CustomPotionColor\s)
NBT related server crash exploits
Oversized packets (which crash the client)
Long item names/item lore
Additional "AttributeModifiers" on items (eg. Speed)
Unbreakable items
Modified Spawn Eggs which can be exploitative (eg. massive Slimes which cause FPS dips)
Non-textures.minecraft.net heads. eg. HD heads created with education.minecraft.net (enable in config)
FAWE brush NBT (enable in config)
and more abusive NBT

More useful information can be found here: EnotTeam - Minecraft Servers Creation

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How to fix NBT tag errors

What is the error?

How to fix it?