CLASS bxt net/minecraft/world/chunk/UpgradeData
	CLASS bxt$b
		FIELD a BLACKLIST Lbxt$b;
		FIELD b DEFAULT Lbxt$b;
		FIELD c CHEST Lbxt$b;
		FIELD d LEAVES Lbxt$b;
		FIELD e STEM_BLOCK Lbxt$b;
	FIELD a NO_UPGRADE_DATA Lbxt;
	FIELD b LOGGER Lorg/apache/logging/log4j/Logger;
	FIELD d sides Ljava/util/EnumSet;
	FIELD e indices [[I
	METHOD <init> (Lib;)V
		ARG 1 tag
	METHOD b toTag ()Lib;