diff --git a/mappings/net/minecraft/server/world/ChunkTicketManager.mapping b/mappings/net/minecraft/server/world/ChunkTicketManager.mapping
index e8d1b1322c..fc0ef491fb 100644
--- a/mappings/net/minecraft/server/world/ChunkTicketManager.mapping
+++ b/mappings/net/minecraft/server/world/ChunkTicketManager.mapping
@@ -13,6 +13,8 @@ CLASS net/minecraft/class_3204 net/minecraft/server/world/ChunkTicketManager
 	FIELD field_17459 chunkPositions Lit/unimi/dsi/fastutil/longs/LongSet;
 	FIELD field_17460 mainThreadExecutor Ljava/util/concurrent/Executor;
 	FIELD field_18252 distanceFromTicketTracker Lnet/minecraft/class_3204$class_4077;
+	FIELD field_34886 simulationDistanceTracker Lnet/minecraft/class_6609;
+	FIELD field_34887 simulationDistance I
 	METHOD <init> (Ljava/util/concurrent/Executor;Ljava/util/concurrent/Executor;)V
 		ARG 1 workerExecutor
 		ARG 2 mainThreadExecutor
@@ -68,6 +70,11 @@ CLASS net/minecraft/class_3204 net/minecraft/server/world/ChunkTicketManager
 	METHOD method_21623 getTicket (J)Ljava/lang/String;
 		ARG 1 pos
 	METHOD method_21683 toDumpString ()Ljava/lang/String;
+	METHOD method_38629 setSimulationDistance (I)V
+		ARG 1 simulationDistance
+	METHOD method_38630 isSimulating (J)Z
+		ARG 1 chunkPos
+	METHOD method_38633 getPlayerSimulationLevel ()I
 	CLASS class_3205 DistanceFromNearestPlayerTracker
 		FIELD field_13896 distanceFromNearestPlayer Lit/unimi/dsi/fastutil/longs/Long2ByteMap;
 		FIELD field_17461 maxDistance I
diff --git a/mappings/net/minecraft/server/world/ServerChunkManager.mapping b/mappings/net/minecraft/server/world/ServerChunkManager.mapping
index 449b6ef77e..eee6791ac1 100644
--- a/mappings/net/minecraft/server/world/ServerChunkManager.mapping
+++ b/mappings/net/minecraft/server/world/ServerChunkManager.mapping
@@ -98,6 +98,7 @@ CLASS net/minecraft/class_3215 net/minecraft/server/world/ServerChunkManager
 	METHOD method_37114 isTickingFutureReady (J)Z
 		ARG 1 pos
 	METHOD method_38634 applySimulationDistance (I)V
+		ARG 1 simulationDistance
 	CLASS class_4212 MainThreadExecutor
 		METHOD <init> (Lnet/minecraft/class_3215;Lnet/minecraft/class_1937;)V
 			ARG 2 world
diff --git a/mappings/net/minecraft/world/SimulationDistanceLevelPropagator.mapping b/mappings/net/minecraft/world/SimulationDistanceLevelPropagator.mapping
new file mode 100644
index 0000000000..07c072cc2f
--- /dev/null
+++ b/mappings/net/minecraft/world/SimulationDistanceLevelPropagator.mapping
@@ -0,0 +1,32 @@
+CLASS net/minecraft/class_6609 net/minecraft/world/SimulationDistanceLevelPropagator
+	FIELD field_34888 levels Lit/unimi/dsi/fastutil/longs/Long2ByteMap;
+	FIELD field_34890 tickets Lit/unimi/dsi/fastutil/longs/Long2ObjectOpenHashMap;
+	METHOD method_38635 updateLevels ()V
+	METHOD method_38636 updatePlayerTickets (I)V
+		ARG 1 level
+	METHOD method_38637 add (JLnet/minecraft/class_3228;)V
+		ARG 1 pos
+		ARG 3 ticket
+	METHOD method_38638 add (Lnet/minecraft/class_3230;Lnet/minecraft/class_1923;ILjava/lang/Object;)V
+		ARG 1 type
+		ARG 2 pos
+		ARG 3 level
+		ARG 4 argument
+	METHOD method_38639 getLevel (Lnet/minecraft/class_4706;)I
+		ARG 1 ticket
+	METHOD method_38640 getLevel (Lnet/minecraft/class_1923;)I
+		ARG 1 pos
+	METHOD method_38641 remove (JLnet/minecraft/class_3228;)V
+		ARG 1 pos
+		ARG 3 ticket
+	METHOD method_38642 remove (Lnet/minecraft/class_3230;Lnet/minecraft/class_1923;ILjava/lang/Object;)V
+		ARG 1 type
+		ARG 2 pos
+		ARG 3 level
+		ARG 4 argument
+	METHOD method_38643 getTickingTicket (J)Ljava/lang/String;
+		ARG 1 pos
+	METHOD method_38644 getTickets (J)Lnet/minecraft/class_4706;
+		ARG 1 pos
+	METHOD method_38645 (J)Lnet/minecraft/class_4706;
+		ARG 0 p