Hello, I can’t seem to be be able to query anything to the the 3rd row of a player’s inventory.
Test Code:
player.getInventory().query(new SlotPos(0,3)).set(ItemStack.of(ItemTypes.COOKED_FISH, 1));
player.getInventory().query(new SlotPos(1,3)).set(ItemStack.of(ItemTypes.DIAMOND, 1));
player.getInventory().query(new SlotPos(0,2)).set(ItemStack.of(ItemTypes.WEB, 1));
player.getInventory().query(new SlotPos(1,2)).set(ItemStack.of(ItemTypes.APPLE, 1));
player.getInventory().query(new SlotPos(0,1)).set(ItemStack.of(ItemTypes.ACACIA_DOOR, 1));
player.getInventory().query(new SlotPos(1,1)).set(ItemStack.of(ItemTypes.BAKED_POTATO, 1));
player.getInventory().query(new SlotPos(0,0)).set(ItemStack.of(ItemTypes.ANVIL, 1));
player.getInventory().query(new SlotPos(1,0)).set(ItemStack.of(ItemTypes.COOKED_RABBIT, 3));
Result:

