Fixed not being able to place blocks inside dead players

closes #2265

src/pocketmine/Player.php

@@ -535,7 +535,7 @@ class Player extends Human implements CommandSender, ChunkLoader, IPlayer{
 	}
 
 	public function canBeCollidedWith() : bool{
-		return !$this->isSpectator();
+		return !$this->isSpectator() and parent::canBeCollidedWith();
 	}
 
 	public function resetFallDistance() : void{

src/pocketmine/entity/Entity.php

@@ -1101,7 +1101,7 @@ abstract class Entity extends Location implements Metadatable, EntityIds{
 	}
 
 	public function canBeCollidedWith() : bool{
-		return true;
+		return $this->isAlive();
 	}
 
 	protected function updateMovement(bool $teleport = false) : void{