Added block break tool type, fixed falling sand, fixed duplicated jungle leaves

src/pocketmine/block/SignPost.php

@@ -22,6 +22,7 @@
 namespace pocketmine\block;
 
 use pocketmine\item\Item;
+use pocketmine\item\Tool;
 use pocketmine\level\Level;
 use pocketmine\Player;
 
@@ -97,4 +98,8 @@ class SignPost extends Transparent{
 			[Item::SIGN, 0, 1],
 		];
 	}
+
+	public function getToolType(){
+		return Tool::TYPE_AXE;
+	}
 }