Readd network optimization patch

patches/server/0410-Prevent-position-desync-in-playerconnection-causing-.patch

@@ -0,0 +1,31 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Fri, 12 Jun 2020 16:51:39 -0700
+Subject: [PATCH] Prevent position desync in playerconnection causing tp
+ exploit
+
+Caused the server to revert to the player's overworld coordinates
+after teleporting into the end.
+
+Sidenote: The underlying issue is that the move call can teleport
+entities and do other things like kill the entity. In the future,
+to fix all exploits derieved from this usually unexpected
+behaviour, we need to move all of this dangerous logic outside
+of the move call and into an appropriate place in the tick method.
+
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index e2ee006d6b6971b15741f304945bbe480789079b..00e10043b00584595665865c1c8dc692db8ba020 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -1340,6 +1340,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
+ 
+                             this.player.move(MoverType.PLAYER, new Vec3(d6, d7, d8));
+                             this.player.onGround = packet.isOnGround(); // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move
++                            // Paper start - prevent position desync
++                            if (this.awaitingPositionFromClient != null) {
++                                return; // ... thanks Mojang for letting move calls teleport across dimensions.
++                            }
++                            // Paper end - prevent position desync
+                             double d11 = d7;
+ 
+                             d6 = d0 - this.player.getX();