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Minecraft 1.19.4 -> 1.20 Mod Migration Primer

This is a high level, non-exhaustive overview on how to migrate your mod from 1.19.4 to 1.20 using Forge.

This primer is licensed under the Creative Commons Attribution 4.0 International, so feel free to use it as a reference and leave a link so that other readers can consume the primer.

If there's any incorrect or missing information, please leave a comment below. Thanks!

Pack Changes

Minecraft allowed emojis

Ever wondered how to insert emoji in minecraft? Well turns out Minecraft supports only a subset of emoji (old one) but you can copy-paste these in it!

These also look great on signs!

	using System;
	using System.Collections.Generic;
	using System.Reflection;
	using System.Text;
	using UnityEditor;
	using UnityEngine;
	using UnityEngine.Pool;
	using UnityEngine.UI;

	public class SceneViewObjectPickerContextWindow : EditorWindow

	/*
	MIT License

	Copyright (c) [year] [fullname]

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is

	using UnityEngine;
	using UnityEngine.EventSystems;
	using UnityEngine.Rendering;
	using UnityEngine.UIElements;
	#if ENABLE_INPUT_SYSTEM
	using UnityEngine.InputSystem.UI;
	#endif

	#if UNITY_EDITOR
	using UnityEditor;

	using System.Collections.Generic;
	using System.IO;
	using UnityEditor;
	using UnityEditor.Overlays;
	using UnityEditor.SceneManagement;
	using UnityEditor.Toolbars;
	using UnityEngine;
	using UnityEngine.SceneManagement;
	using UnityEngine.UIElements;

	using System.Collections.Generic;
	using UnityEngine;
	using UnityEngine.Sprites;
	using UnityEngine.UI;
	#if UNITY_2017_4 \|\| UNITY_2018_2_OR_NEWER
	using UnityEngine.U2D;
	#endif

	#if UNITY_EDITOR
	using UnityEditor;

	using System;
	using System.Collections;
	using System.Collections.Generic;
	using UnityEngine;

	public class MeshDestroy : MonoBehaviour
	{
	private bool edgeSet = false;
	private Vector3 edgeVertex = Vector3.zero;
	private Vector2 edgeUV = Vector2.zero;

	#if UNITY_EDITOR

	using System;
	using System.Reflection;
	using UnityEditor;
	using UnityEngine;

	/// <summary>
	/// Little utility for opening a "Game" view in fullscreen. Will be opened on whatever Unity thinks is the "main"
	/// monitor at the moment. The hotkey will toggle the window; however, if for some reason this breaks, fullscreen