Bucket: implement MaybeConsumable, fixes #3306

this is a nauseating fix, but it's only needed for stable.

src/pocketmine/item/Bucket.php

@@ -33,7 +33,7 @@ use pocketmine\event\player\PlayerBucketFillEvent;
 use pocketmine\math\Vector3;
 use pocketmine\Player;
 
-class Bucket extends Item implements Consumable{
+class Bucket extends Item implements MaybeConsumable{
 	public function __construct(int $meta = 0){
 		parent::__construct(self::BUCKET, $meta, "Bucket");
 	}

src/pocketmine/item/MaybeConsumable.php

@@ -0,0 +1,36 @@
+<?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\item;
+
+/**
+ * Items which are sometimes (but not always) consumable should implement this interface.
+ *
+ * Note: If implementing custom items, consider making separate items instead of using this.
+ * This interface serves as a workaround for the consumability of buckets and shouldn't
+ * really be used for anything else.
+ */
+interface MaybeConsumable extends Consumable{
+
+	public function canBeConsumed() : bool;
+}