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What does it do and how is it useful? Please assume that we have never heard of it before. Just mentioning a name won't work. If it's for an older version of Minecraft (like 1.8 or 1.12), please mention that too.
It prevents chests with NBT tags from kicking you out of a server
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This is done in 1.16 by removing the limit from the PacketInflater#decode method
You can use a Mixin for this.