CLASS qt net/minecraft/migration/MigrationTypes
FIELD a LEVEL_PROPERTIES Lqt;
FIELD b PLAYER_DATA Lqt;
FIELD c LEVEL_DATA Lqt;
FIELD d BLOCK_ENTITY Lqt;
FIELD e ENTITY Lqt;
FIELD f ITEM_STACK Lqt;
FIELD g GAME_SETTINGS Lqt;