First (untested) look at hooking all the itemstack serializer/deserializer stuff together

this should address #5063 and related issues, if it works correctly.

src/data/bedrock/item/upgrade/ItemIdMetaUpgradeSchema.php

@@ -0,0 +1,49 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\data\bedrock\item\upgrade;
+
+final class ItemIdMetaUpgradeSchema{
+
+	/**
+	 * @param string[] $renamedIds
+	 * @param string[][] $remappedMetas
+	 * @phpstan-param array<string, string> $renamedIds
+	 * @phpstan-param array<string, array<int, string>> $remappedMetas
+	 */
+	public function __construct(
+		private array $renamedIds,
+		private array $remappedMetas,
+		private int $priority
+	){}
+
+	public function getPriority() : int{ return $this->priority; }
+
+	public function renameId(string $id) : ?string{
+		return $this->renamedIds[$id] ?? null;
+	}
+
+	public function remapMeta(string $id, int $meta) : ?string{
+		return $this->remappedMetas[$id][$meta] ?? null;
+	}
+}