Paper/paper-server/patches/sources/net/minecraft/server/network/PlayerChunkSender.java.patch

--- a/net/minecraft/server/network/PlayerChunkSender.java
+++ b/net/minecraft/server/network/PlayerChunkSender.java
@@ -44,6 +_,11 @@
     public void dropChunk(ServerPlayer player, ChunkPos chunkPos) {
         if (!this.pendingChunks.remove(chunkPos.toLong()) && player.isAlive()) {
             player.connection.send(new ClientboundForgetLevelChunkPacket(chunkPos));
+            // Paper start - PlayerChunkUnloadEvent
+            if (io.papermc.paper.event.packet.PlayerChunkUnloadEvent.getHandlerList().getRegisteredListeners().length > 0) {
+                new io.papermc.paper.event.packet.PlayerChunkUnloadEvent(player.getBukkitEntity().getWorld().getChunkAt(chunkPos.longKey), player.getBukkitEntity()).callEvent();
+            }
+            // Paper end - PlayerChunkUnloadEvent
         }
     }
 
@@ -75,6 +_,11 @@
 
     private static void sendChunk(ServerGamePacketListenerImpl packetListener, ServerLevel level, LevelChunk chunk) {
         packetListener.send(new ClientboundLevelChunkWithLightPacket(chunk, level.getLightEngine(), null, null));
+        // Paper start - PlayerChunkLoadEvent
+        if (io.papermc.paper.event.packet.PlayerChunkLoadEvent.getHandlerList().getRegisteredListeners().length > 0) {
+            new io.papermc.paper.event.packet.PlayerChunkLoadEvent(new org.bukkit.craftbukkit.CraftChunk(chunk), packetListener.getPlayer().getBukkitEntity()).callEvent();
+        }
+        // Paper end - PlayerChunkLoadEvent
         ChunkPos pos = chunk.getPos();
         DebugPackets.sendPoiPacketsForChunk(level, pos);
     }