Player Sneak Packet
https://github.com/ViaVersion/ViaFabricPlus/blob/56c4959000e68d77fd415b89af7a95478d825079/src/main/java/com/viaversion/viafabricplus/injection/mixin/features/movement/sprinting_and_sneaking/MixinClientPlayerEntity.java#L251-L264
Functions
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Writes the actual information to the packetWrapper.