--- a/net/minecraft/network/protocol/PacketUtils.java
+++ b/net/minecraft/network/protocol/PacketUtils.java
@@ -6,10 +6,15 @@
 import net.minecraft.CrashReportCategory;
 import net.minecraft.ReportedException;
 import net.minecraft.network.PacketListener;
+import org.slf4j.Logger;
+
+// CraftBukkit start
+import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.RunningOnDifferentThreadException;
 import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.network.ServerCommonPacketListenerImpl;
+// CraftBukkit end
 import net.minecraft.util.thread.BlockableEventLoop;
-import org.slf4j.Logger;
 
 public class PacketUtils {
 
@@ -24,6 +29,7 @@
     public static <T extends PacketListener> void ensureRunningOnSameThread(Packet<T> packet, T listener, BlockableEventLoop<?> engine) throws RunningOnDifferentThreadException {
         if (!engine.isSameThread()) {
             engine.executeIfPossible(() -> {
+                if (listener instanceof ServerCommonPacketListenerImpl serverCommonPacketListener && serverCommonPacketListener.processedDisconnect) return; // CraftBukkit - Don't handle sync packets for kicked players
                 if (listener.shouldHandleMessage(packet)) {
                     try {
                         packet.handle(listener);