diff --git a/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/CraftRecipeOptionalStackRequestAction.php b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/CraftRecipeOptionalStackRequestAction.php
new file mode 100644
index 000000000..9047947c8
--- /dev/null
+++ b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/CraftRecipeOptionalStackRequestAction.php
@@ -0,0 +1,59 @@
+<?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\network\mcpe\protocol\types\inventory\stackrequest;
+
+use pocketmine\network\mcpe\NetworkBinaryStream;
+
+/**
+ * Renames an item in an anvil, or map on a cartography table.
+ */
+final class CraftRecipeOptionalStackRequestAction extends ItemStackRequestAction{
+
+	/** @var int */
+	private $recipeId;
+	/** @var int */
+	private $filterStringIndex;
+
+	public function __construct(int $type, int $filterStringIndex){
+		$this->recipeId = $type;
+		$this->filterStringIndex = $filterStringIndex;
+	}
+
+	public function getRecipeId() : int{ return $this->recipeId; }
+
+	public function getFilterStringIndex() : int{ return $this->filterStringIndex; }
+
+	public static function getTypeId() : int{ return ItemStackRequestActionType::CRAFTING_RECIPE_OPTIONAL; }
+
+	public static function read(NetworkBinaryStream $in) : self{
+		$recipeId = $in->readGenericTypeNetworkId();
+		$filterStringIndex = $in->getLInt();
+		return new self($recipeId, $filterStringIndex);
+	}
+
+	public function write(NetworkBinaryStream $out) : void{
+		$out->writeGenericTypeNetworkId($this->recipeId);
+		$out->putLInt($this->filterStringIndex);
+	}
+}
diff --git a/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequest.php b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequest.php
index 648eb295a..688b8fa94 100644
--- a/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequest.php
+++ b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequest.php
@@ -32,13 +32,21 @@ final class ItemStackRequest{
 	private $requestId;
 	/** @var ItemStackRequestAction[] */
 	private $actions;
+	/**
+	 * @var string[]
+	 * @phpstan-var list<string>
+	 */
+	private $filterStrings;
 
 	/**
 	 * @param ItemStackRequestAction[] $actions
+	 * @param string[]                 $filterStrings
+	 * @phpstan-param list<string> $filterStrings
 	 */
-	public function __construct(int $requestId, array $actions){
+	public function __construct(int $requestId, array $actions, array $filterStrings){
 		$this->requestId = $requestId;
 		$this->actions = $actions;
+		$this->filterStrings = $filterStrings;
 	}
 
 	public function getRequestId() : int{ return $this->requestId; }
@@ -60,6 +68,7 @@ final class ItemStackRequest{
 			case CraftRecipeStackRequestAction::getTypeId(): return CraftRecipeStackRequestAction::read($in);
 			case CraftRecipeAutoStackRequestAction::getTypeId(): return CraftRecipeAutoStackRequestAction::read($in);
 			case CreativeCreateStackRequestAction::getTypeId(): return CreativeCreateStackRequestAction::read($in);
+			case CraftRecipeOptionalStackRequestAction::getTypeId(): return CraftRecipeOptionalStackRequestAction::read($in);
 			case DeprecatedCraftingNonImplementedStackRequestAction::getTypeId(): return DeprecatedCraftingNonImplementedStackRequestAction::read($in);
 			case DeprecatedCraftingResultsStackRequestAction::getTypeId(): return DeprecatedCraftingResultsStackRequestAction::read($in);
 		}
@@ -73,7 +82,11 @@ final class ItemStackRequest{
 			$typeId = $in->getByte();
 			$actions[] = self::readAction($in, $typeId);
 		}
-		return new self($requestId, $actions);
+		$filterStrings = [];
+		for($i = 0, $len = $in->getUnsignedVarInt(); $i < $len; ++$i){
+			$filterStrings[] = $in->getString();
+		}
+		return new self($requestId, $actions, $filterStrings);
 	}
 
 	public function write(NetworkBinaryStream $out) : void{
@@ -83,5 +96,9 @@ final class ItemStackRequest{
 			$out->putByte($action::getTypeId());
 			$action->write($out);
 		}
+		$out->putUnsignedVarInt(count($this->filterStrings));
+		foreach($this->filterStrings as $string){
+			$out->putString($string);
+		}
 	}
 }
diff --git a/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequestActionType.php b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequestActionType.php
index 08816c70b..7dea5c210 100644
--- a/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequestActionType.php
+++ b/src/pocketmine/network/mcpe/protocol/types/inventory/stackrequest/ItemStackRequestActionType.php
@@ -41,6 +41,7 @@ final class ItemStackRequestActionType{
 	public const CRAFTING_RECIPE = 9;
 	public const CRAFTING_RECIPE_AUTO = 10; //recipe book?
 	public const CREATIVE_CREATE = 11;
-	public const CRAFTING_NON_IMPLEMENTED_DEPRECATED_ASK_TY_LAING = 12; //anvils aren't fully implemented yet
-	public const CRAFTING_RESULTS_DEPRECATED_ASK_TY_LAING = 13; //no idea what this is for
+	public const CRAFTING_RECIPE_OPTIONAL = 12; //anvil/cartography table rename
+	public const CRAFTING_NON_IMPLEMENTED_DEPRECATED_ASK_TY_LAING = 13;
+	public const CRAFTING_RESULTS_DEPRECATED_ASK_TY_LAING = 14; //no idea what this is for
 }