some work

patches/server/0217-Refresh-player-inventory-when-cancelling-PlayerInter.patch

@@ -0,0 +1,29 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Minecrell <minecrell@minecrell.net>
+Date: Fri, 13 Jul 2018 14:54:43 +0200
+Subject: [PATCH] Refresh player inventory when cancelling
+ PlayerInteractEntityEvent
+
+When interacting with entities with an item, the client will assume
+the interaction is successful, and update the held item on the
+client. However, if the interaction is cancelled on the server side,
+the client will still mistakenly remove/replace the item in hand.
+
+Examples for this are milking cows with a bucket or dyeing sheep.
+The bucket is replaced with milk and the dye removed from inventory.
+
+Refresh the player inventory when PlayerInteractEntityEvent is
+cancelled to avoid this problem.
+
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 025eacdf53f42b47f5815cbacfe74d0990da0e42..4af898571bfe218d38ce8a1ec042f142317cd00d 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -2398,6 +2398,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
+                             }
+ 
+                             if (event.isCancelled()) {
++                            ServerGamePacketListenerImpl.this.player.containerMenu.sendAllDataToRemote(); // Paper - Refresh player inventory
+                                 return;
+                             }
+                             // CraftBukkit end