diff --git a/changelogs/4.20.md b/changelogs/4.20.md
index 4a91ab440..bc8c931b2 100644
--- a/changelogs/4.20.md
+++ b/changelogs/4.20.md
@@ -51,3 +51,16 @@ Released 4th May 2023.
 ## Fixes
 - Fixed all types of wooden logs appearing as oak in the inventory.
 - Fixed a performance issue in `BaseInventory->canAddItem()` (missing `continue` causing useless logic to run).
+
+# 4.20.3
+Released 6th May 2023.
+
+## Improvements
+- Reduced memory usage of `RuntimeBlockMapping` from 25 MB to 9 MB. Since every thread has its own copy of the block map, this saves a substantial amount of memory.
+
+## Fixes
+- Fixed players falling through blocks in spectator mode.
+- Fixed timings reports getting bloated by prolific usage of `PluginManager->registerEvent()`.
+  - This was caused by creating a new timings handler for each call, regardless of whether a timer already existed for the given event and callback.
+- Fixed `Full Server Tick` and other records being missing from timings reports.
+  - This was caused by timings handler depth not getting reset when timings was disabled and later re-enabled.
diff --git a/src/VersionInfo.php b/src/VersionInfo.php
index df44e6982..0b72d7f9e 100644
--- a/src/VersionInfo.php
+++ b/src/VersionInfo.php
@@ -31,7 +31,7 @@ use function str_repeat;
 
 final class VersionInfo{
 	public const NAME = "PocketMine-MP";
-	public const BASE_VERSION = "4.20.3";
+	public const BASE_VERSION = "4.20.4";
 	public const IS_DEVELOPMENT_BUILD = true;
 	public const BUILD_CHANNEL = "stable";
 
diff --git a/src/network/mcpe/NetworkSession.php b/src/network/mcpe/NetworkSession.php
index bff5875b7..1b90547e7 100644
--- a/src/network/mcpe/NetworkSession.php
+++ b/src/network/mcpe/NetworkSession.php
@@ -894,6 +894,12 @@ class NetworkSession{
 			[
 				//TODO: dynamic flying speed! FINALLY!!!!!!!!!!!!!!!!!
 				new AbilitiesLayer(AbilitiesLayer::LAYER_BASE, $boolAbilities, 0.05, 0.1),
+
+				//TODO: HACK! In 1.19.80, the client starts falling in our faux spectator mode when it clips into a
+				//block. I have no idea why this works, since we don't actually use the real spectator mode.
+				new AbilitiesLayer(AbilitiesLayer::LAYER_SPECTATOR, [
+					AbilitiesLayer::ABILITY_FLYING => true,
+				], null, null)
 			]
 		)));
 	}
diff --git a/src/plugin/PluginManager.php b/src/plugin/PluginManager.php
index d109b23fa..725c915a1 100644
--- a/src/plugin/PluginManager.php
+++ b/src/plugin/PluginManager.php
@@ -37,7 +37,7 @@ use pocketmine\permission\DefaultPermissions;
 use pocketmine\permission\PermissionManager;
 use pocketmine\permission\PermissionParser;
 use pocketmine\Server;
-use pocketmine\timings\TimingsHandler;
+use pocketmine\timings\Timings;
 use pocketmine\utils\AssumptionFailedError;
 use pocketmine\utils\Utils;
 use Symfony\Component\Filesystem\Path;
@@ -651,7 +651,7 @@ class PluginManager{
 			throw new PluginException("Plugin attempted to register event handler " . $handlerName . "() to event " . $event . " while not enabled");
 		}
 
-		$timings = new TimingsHandler($handlerName . "(" . (new \ReflectionClass($event))->getShortName() . ")", group: $plugin->getDescription()->getFullName());
+		$timings = Timings::getEventHandlerTimings($event, $handlerName, $plugin->getDescription()->getFullName());
 
 		$registeredListener = new RegisteredListener($handler, $priority, $plugin, $handleCancelled, $timings);
 		HandlerListManager::global()->getListFor($event)->register($registeredListener);
diff --git a/src/timings/Timings.php b/src/timings/Timings.php
index a400a73b4..74fa40dde 100644
--- a/src/timings/Timings.php
+++ b/src/timings/Timings.php
@@ -166,6 +166,8 @@ abstract class Timings{
 
 	/** @var TimingsHandler[] */
 	private static array $events = [];
+	/** @var TimingsHandler[][] */
+	private static array $eventHandlers = [];
 
 	public static function init() : void{
 		if(self::$initialized){
@@ -336,4 +338,16 @@ abstract class Timings{
 
 		return self::$events[$eventClass];
 	}
+
+	/**
+	 * @phpstan-template TEvent of Event
+	 * @phpstan-param class-string<TEvent> $event
+	 */
+	public static function getEventHandlerTimings(string $event, string $handlerName, string $group) : TimingsHandler{
+		if(!isset(self::$eventHandlers[$event][$handlerName])){
+			self::$eventHandlers[$event][$handlerName] = new TimingsHandler($handlerName . "(" . self::shortenCoreClassName($event, "pocketmine\\event\\") . ")", group: $group);
+		}
+
+		return self::$eventHandlers[$event][$handlerName];
+	}
 }
diff --git a/src/timings/TimingsHandler.php b/src/timings/TimingsHandler.php
index d23b3a34a..73e963875 100644
--- a/src/timings/TimingsHandler.php
+++ b/src/timings/TimingsHandler.php
@@ -96,7 +96,7 @@ class TimingsHandler{
 	}
 
 	public static function reload() : void{
-		TimingsRecord::clearRecords();
+		TimingsRecord::reset();
 		if(self::$enabled){
 			self::$timingStart = hrtime(true);
 		}
@@ -204,8 +204,9 @@ class TimingsHandler{
 	/**
 	 * @internal
 	 */
-	public function destroyCycles() : void{
+	public function reset() : void{
 		$this->rootRecord = null;
 		$this->recordsByParent = [];
+		$this->timingDepth = 0;
 	}
 }
diff --git a/src/timings/TimingsRecord.php b/src/timings/TimingsRecord.php
index 5254d2e7d..f09984b5b 100644
--- a/src/timings/TimingsRecord.php
+++ b/src/timings/TimingsRecord.php
@@ -42,9 +42,12 @@ final class TimingsRecord{
 
 	private static ?self $currentRecord = null;
 
-	public static function clearRecords() : void{
+	/**
+	 * @internal
+	 */
+	public static function reset() : void{
 		foreach(self::$records as $record){
-			$record->handler->destroyCycles();
+			$record->handler->reset();
 		}
 		self::$records = [];
 		self::$currentRecord = null;