diff --git a/changelogs/4.19.md b/changelogs/4.19.md
index b8127b335..89ef3140b 100644
--- a/changelogs/4.19.md
+++ b/changelogs/4.19.md
@@ -94,3 +94,18 @@ Released 14th April 2023.
 - Fixed player timings duplication leading to extremely large timings reports when timings runs for a long time with many players.
 - Packet timings are now indexed by class FQN instead of packet ID. This prevents erroneous timer reuse on packet ID reuse (e.g. multi version servers).
 - Fixed entity timings being shared by different classes with the same short name. This led to incorrect timings being reported for some entities when custom entities were used.
+
+# 4.19.3
+Released 21st April 2023.
+
+## General
+- Error IDs for `Packet processing error` disconnects are now split into 4-character chunks to make them easier to type (since they can't be copied from the disconnection screen of a client).
+
+## Fixes
+- Fixed entity-block intersections being checked twice per tick. Besides wasting CPU time, this may have caused unexpected behaviour during entity-block interactions with blocks like water or cacti.
+- Fixed performance issue in network inventory synchronization due item NBT being prepared twice.
+- Fixed `tools/simulate-chunk-selector.php` argument parsing being completely broken (weird behaviour of PHP `getopt()`).
+
+## Internals
+- `TimingsHandler->stopTiming()` now logs an error message if a subtimer wasn't stopped, rather than throwing an exception.
+  - Due to interactions between `try...finally` and unexpected errors, throwing exceptions made it difficult for plugin developers to debug errors in their plugins, since it obscured the original error.
diff --git a/src/crafting/CraftingManager.php b/src/crafting/CraftingManager.php
index 42d11ce9f..1b1428b05 100644
--- a/src/crafting/CraftingManager.php
+++ b/src/crafting/CraftingManager.php
@@ -56,7 +56,7 @@ class CraftingManager{
 	 * @var FurnaceRecipeManager[]
 	 * @phpstan-var array<int, FurnaceRecipeManager>
 	 */
-	protected array $furnaceRecipeManagers;
+	protected array $furnaceRecipeManagers = [];
 
 	/**
 	 * @var PotionTypeRecipe[][]
diff --git a/src/event/HandlerList.php b/src/event/HandlerList.php
index 6b1a39d94..37811e959 100644
--- a/src/event/HandlerList.php
+++ b/src/event/HandlerList.php
@@ -99,7 +99,7 @@ class HandlerList{
 	 * @return RegisteredListener[]
 	 */
 	public function getListenersByPriority(int $priority) : array{
-		return $this->handlerSlots[$priority];
+		return $this->handlerSlots[$priority] ?? [];
 	}
 
 	public function getParent() : ?HandlerList{
diff --git a/src/network/mcpe/InventoryManagerEntry.php b/src/network/mcpe/InventoryManagerEntry.php
index ac2a40dfe..deb2e8e4d 100644
--- a/src/network/mcpe/InventoryManagerEntry.php
+++ b/src/network/mcpe/InventoryManagerEntry.php
@@ -40,7 +40,7 @@ final class InventoryManagerEntry{
 	public array $itemStackInfos = [];
 
 	/**
-	 * @var int[]
+	 * @var ItemStack[]
 	 * @phpstan-var array<int, ItemStack>
 	 */
 	public array $pendingSyncs = [];
diff --git a/src/network/mcpe/handler/InGamePacketHandler.php b/src/network/mcpe/handler/InGamePacketHandler.php
index 95f693c9c..67c802679 100644
--- a/src/network/mcpe/handler/InGamePacketHandler.php
+++ b/src/network/mcpe/handler/InGamePacketHandler.php
@@ -325,6 +325,9 @@ class InGamePacketHandler extends PacketHandler{
 		if(count($packet->trData->getActions()) > 50){
 			throw new PacketHandlingException("Too many actions in inventory transaction");
 		}
+		if(count($packet->requestChangedSlots) > 10){
+			throw new PacketHandlingException("Too many slot sync requests in inventory transaction");
+		}
 
 		$this->inventoryManager->setCurrentItemStackRequestId($packet->requestId);
 		$this->inventoryManager->addRawPredictedSlotChanges($packet->trData->getActions());
@@ -344,6 +347,21 @@ class InGamePacketHandler extends PacketHandler{
 		}
 
 		$this->inventoryManager->syncMismatchedPredictedSlotChanges();
+
+		//requestChangedSlots asks the server to always send out the contents of the specified slots, even if they
+		//haven't changed. Handling these is necessary to ensure the client inventory stays in sync if the server
+		//rejects the transaction. The most common example of this is equipping armor by right-click, which doesn't send
+		//a legacy prediction action for the destination armor slot.
+		foreach($packet->requestChangedSlots as $containerInfo){
+			$windowId = ItemStackContainerIdTranslator::translate($containerInfo->getContainerId(), $this->inventoryManager->getCurrentWindowId());
+			foreach($containerInfo->getChangedSlotIndexes() as $slot){
+				$inventoryAndSlot = $this->inventoryManager->locateWindowAndSlot($windowId, $slot);
+				if($inventoryAndSlot !== null){ //trigger the normal slot sync logic
+					$this->inventoryManager->onSlotChange($inventoryAndSlot[0], $inventoryAndSlot[1]);
+				}
+			}
+		}
+
 		$this->inventoryManager->setCurrentItemStackRequestId(null);
 		return $result;
 	}
diff --git a/src/network/mcpe/handler/ItemStackRequestExecutor.php b/src/network/mcpe/handler/ItemStackRequestExecutor.php
index 124606112..b7f9b1604 100644
--- a/src/network/mcpe/handler/ItemStackRequestExecutor.php
+++ b/src/network/mcpe/handler/ItemStackRequestExecutor.php
@@ -23,7 +23,6 @@ declare(strict_types=1);
 
 namespace pocketmine\network\mcpe\handler;
 
-use pocketmine\crafting\CraftingGrid;
 use pocketmine\inventory\CreativeInventory;
 use pocketmine\inventory\Inventory;
 use pocketmine\inventory\transaction\action\CreateItemAction;
@@ -246,13 +245,11 @@ class ItemStackRequestExecutor{
 
 		$this->specialTransaction = new CraftingTransaction($this->player, $craftingManager, [], $recipe, $repetitions);
 
-		$currentWindow = $this->player->getCurrentWindow();
-		if($currentWindow !== null && !($currentWindow instanceof CraftingGrid)){
-			throw new ItemStackRequestProcessException("Player's current window is not a crafting grid");
-		}
-		$craftingGrid = $currentWindow ?? $this->player->getCraftingGrid();
-
-		$craftingResults = $recipe->getResultsFor($craftingGrid);
+		//TODO: Since the system assumes that crafting can only be done in the crafting grid, we have to give it a
+		//crafting grid to make the API happy. No implementation of getResultsFor() actually uses the crafting grid
+		//right now, so this will work, but this will become a problem in the future for things like shulker boxes and
+		//custom crafting recipes.
+		$craftingResults = $recipe->getResultsFor($this->player->getCraftingGrid());
 		foreach($craftingResults as $k => $craftingResult){
 			$craftingResult->setCount($craftingResult->getCount() * $repetitions);
 			$this->craftingResults[$k] = $craftingResult;
diff --git a/src/timings/TimingsHandler.php b/src/timings/TimingsHandler.php
index d43b432bc..d23b3a34a 100644
--- a/src/timings/TimingsHandler.php
+++ b/src/timings/TimingsHandler.php
@@ -174,12 +174,12 @@ class TimingsHandler{
 		}
 
 		$record = TimingsRecord::getCurrentRecord();
-		if($record !== null){
-			if($record->getTimerId() !== spl_object_id($this)){
-				throw new \LogicException("Timer \"" . $record->getName() . "\" should have been stopped before stopping timer \"" . $this->name . "\"");
-			}
+		$timerId = spl_object_id($this);
+		for(; $record !== null && $record->getTimerId() !== $timerId; $record = TimingsRecord::getCurrentRecord()){
+			\GlobalLogger::get()->error("Timer \"" . $record->getName() . "\" should have been stopped before stopping timer \"" . $this->name . "\"");
 			$record->stopTiming($now);
 		}
+		$record?->stopTiming($now);
 		if($this->parent !== null){
 			$this->parent->internalStopTiming($now);
 		}