diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index 735b529af..0afd772f6 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -53,83 +53,89 @@ namespace pocketmine {
 	 * Enjoy it as much as I did writing it. I don't want to do it again.
 	 */
 
-	if(version_compare(MIN_PHP_VERSION, PHP_VERSION) > 0){
-		critical_error(\pocketmine\NAME . " requires PHP >= " . MIN_PHP_VERSION . ", but you have PHP " . PHP_VERSION . ".");
-		critical_error("Please refer to the installation instructions at http://pmmp.rtfd.io/en/rtfd/installation.html.");
-		exit(1);
-	}
-
-	if(PHP_INT_SIZE < 8){
-		critical_error("Running " . \pocketmine\NAME . " with 32-bit systems/PHP is no longer supported.");
-		critical_error("Please upgrade to a 64-bit system, or use a 64-bit PHP binary if this is a 64-bit system.");
-		critical_error("Please refer to the installation instructions at http://pmmp.rtfd.io/en/rtfd/installation.html.");
-		exit(1);
-	}
-
-	/* Dependencies check */
-
-	$errors = 0;
-
-	if(php_sapi_name() !== "cli"){
-		critical_error("You must run " . \pocketmine\NAME . " using the CLI.");
-		++$errors;
-	}
-
-	$extensions = [
-		"bcmath" => "BC Math",
-		"curl" => "cURL",
-		"ctype" => "ctype",
-		"date" => "Date",
-		"hash" => "Hash",
-		"json" => "JSON",
-		"mbstring" => "Multibyte String",
-		"openssl" => "OpenSSL",
-		"pcre" => "PCRE",
-		"phar" => "Phar",
-		"pthreads" => "pthreads",
-		"reflection" => "Reflection",
-		"sockets" => "Sockets",
-		"spl" => "SPL",
-		"yaml" => "YAML",
-		"zip" => "Zip",
-		"zlib" => "Zlib"
-	];
-
-	foreach($extensions as $ext => $name){
-		if(!extension_loaded($ext)){
-			critical_error("Unable to find the $name ($ext) extension.");
-			++$errors;
+	/**
+	 * @return string[]
+	 */
+	function check_platform_dependencies(){
+		if(version_compare(MIN_PHP_VERSION, PHP_VERSION) > 0){
+			//If PHP version isn't high enough, anything below might break, so don't bother checking it.
+			return [
+				\pocketmine\NAME . " requires PHP >= " . MIN_PHP_VERSION . ", but you have PHP " . PHP_VERSION . "."
+			];
 		}
-	}
 
-	if(extension_loaded("pthreads")){
-		$pthreads_version = phpversion("pthreads");
-		if(substr_count($pthreads_version, ".") < 2){
-			$pthreads_version = "0.$pthreads_version";
+		$messages = [];
+
+		if(PHP_INT_SIZE < 8){
+			$messages[] = "Running " . \pocketmine\NAME . " with 32-bit systems/PHP is no longer supported. Please upgrade to a 64-bit system, or use a 64-bit PHP binary if this is a 64-bit system.";
 		}
-		if(version_compare($pthreads_version, "3.1.7dev") < 0){
-			critical_error("pthreads >= 3.1.7dev is required, while you have $pthreads_version.");
-			++$errors;
+
+		if(php_sapi_name() !== "cli"){
+			$messages[] = "You must run " . \pocketmine\NAME . " using the CLI.";
 		}
-	}
 
-	if(extension_loaded("leveldb")){
-		$leveldb_version = phpversion("leveldb");
-		if(version_compare($leveldb_version, "0.2.1") < 0){
-			critical_error("php-leveldb >= 0.2.1 is required, while you have $leveldb_version");
-			++$errors;
+		$extensions = [
+			"bcmath" => "BC Math",
+			"curl" => "cURL",
+			"ctype" => "ctype",
+			"date" => "Date",
+			"hash" => "Hash",
+			"json" => "JSON",
+			"mbstring" => "Multibyte String",
+			"openssl" => "OpenSSL",
+			"pcre" => "PCRE",
+			"phar" => "Phar",
+			"pthreads" => "pthreads",
+			"reflection" => "Reflection",
+			"sockets" => "Sockets",
+			"spl" => "SPL",
+			"yaml" => "YAML",
+			"zip" => "Zip",
+			"zlib" => "Zlib"
+		];
+
+		foreach($extensions as $ext => $name){
+			if(!extension_loaded($ext)){
+				$messages[] = "Unable to find the $name ($ext) extension.";
+			}
 		}
+
+		if(extension_loaded("pthreads")){
+			$pthreads_version = phpversion("pthreads");
+			if(substr_count($pthreads_version, ".") < 2){
+				$pthreads_version = "0.$pthreads_version";
+			}
+			if(version_compare($pthreads_version, "3.1.7dev") < 0){
+				$messages[] = "pthreads >= 3.1.7dev is required, while you have $pthreads_version.";
+			}
+		}
+
+		if(extension_loaded("leveldb")){
+			$leveldb_version = phpversion("leveldb");
+			if(version_compare($leveldb_version, "0.2.1") < 0){
+				$messages[] = "php-leveldb >= 0.2.1 is required, while you have $leveldb_version.";
+			}
+		}
+
+		if(extension_loaded("pocketmine")){
+			$messages[] = "The native PocketMine extension is no longer supported.";
+		}
+
+		return $messages;
 	}
 
-	if(extension_loaded("pocketmine")){
-		critical_error("The native PocketMine extension is no longer supported.");
-		++$errors;
-	}
-
-	if($errors > 0){
+	if(!empty($messages = check_platform_dependencies())){
+		echo PHP_EOL;
+		$binary = version_compare(PHP_VERSION, "5.4") >= 0 ? PHP_BINARY : "unknown";
+		critical_error("Selected PHP binary ($binary) does not satisfy some requirements.");
+		foreach($messages as $m){
+			echo " - $m" . PHP_EOL;
+		}
 		critical_error("Please recompile PHP with the needed configuration, or refer to the installation instructions at http://pmmp.rtfd.io/en/rtfd/installation.html.");
+		echo PHP_EOL;
 		exit(1);
 	}
+	unset($messages);
 
 	error_reporting(-1);
 
diff --git a/src/pocketmine/inventory/DoubleChestInventory.php b/src/pocketmine/inventory/DoubleChestInventory.php
index 06578e19f..781892640 100644
--- a/src/pocketmine/inventory/DoubleChestInventory.php
+++ b/src/pocketmine/inventory/DoubleChestInventory.php
@@ -64,7 +64,12 @@ class DoubleChestInventory extends ChestInventory implements InventoryHolder{
 	}
 
 	public function setItem(int $index, Item $item, bool $send = true) : bool{
-		return $index < $this->left->getSize() ? $this->left->setItem($index, $item, $send) : $this->right->setItem($index - $this->left->getSize(), $item, $send);
+		$old = $this->getItem($index);
+		if($index < $this->left->getSize() ? $this->left->setItem($index, $item, $send) : $this->right->setItem($index - $this->left->getSize(), $item, $send)){
+			$this->onSlotChange($index, $old, $send);
+			return true;
+		}
+		return false;
 	}
 
 	public function getContents(bool $includeEmpty = false) : array{
diff --git a/src/pocketmine/tile/Chest.php b/src/pocketmine/tile/Chest.php
index 15ff38580..beb6d1214 100644
--- a/src/pocketmine/tile/Chest.php
+++ b/src/pocketmine/tile/Chest.php
@@ -113,10 +113,14 @@ class Chest extends Spawnable implements InventoryHolder, Container, Nameable{
 				$pair->checkPairing();
 			}
 			if($this->doubleInventory === null){
-				if(($pair->x + ($pair->z << 15)) > ($this->x + ($this->z << 15))){ //Order them correctly
-					$this->doubleInventory = new DoubleChestInventory($pair, $this);
+				if($pair->doubleInventory !== null){
+					$this->doubleInventory = $pair->doubleInventory;
 				}else{
-					$this->doubleInventory = new DoubleChestInventory($this, $pair);
+					if(($pair->x + ($pair->z << 15)) > ($this->x + ($this->z << 15))){ //Order them correctly
+						$this->doubleInventory = new DoubleChestInventory($pair, $this);
+					}else{
+						$this->doubleInventory = new DoubleChestInventory($this, $pair);
+					}
 				}
 			}
 		}else{