Paper/nms-patches/WorldManager.patch

--- a/net/minecraft/server/WorldManager.java
+++ b/net/minecraft/server/WorldManager.java
@@ -35,7 +35,8 @@
     }
 
     public void a(@Nullable EntityHuman entityhuman, SoundEffect soundeffect, SoundCategory soundcategory, double d0, double d1, double d2, float f, float f1) {
-        this.a.getPlayerList().sendPacketNearby(entityhuman, d0, d1, d2, f > 1.0F ? (double) (16.0F * f) : 16.0D, this.world.worldProvider.getDimensionManager(), new PacketPlayOutNamedSoundEffect(soundeffect, soundcategory, d0, d1, d2, f, f1));
+        // CraftBukkit - this.world.dimension
+        this.a.getPlayerList().sendPacketNearby(entityhuman, d0, d1, d2, f > 1.0F ? (double) (16.0F * f) : 16.0D, this.world.dimension, new PacketPlayOutNamedSoundEffect(soundeffect, soundcategory, d0, d1, d2, f, f1));
     }
 
     public void a(int i, int j, int k, int l, int i1, int j1) {}
@@ -49,7 +50,8 @@
     public void a(SoundEffect soundeffect, BlockPosition blockposition) {}
 
     public void a(EntityHuman entityhuman, int i, BlockPosition blockposition, int j) {
-        this.a.getPlayerList().sendPacketNearby(entityhuman, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 64.0D, this.world.worldProvider.getDimensionManager(), new PacketPlayOutWorldEvent(i, blockposition, j, false));
+        // CraftBukkit - this.world.dimension
+        this.a.getPlayerList().sendPacketNearby(entityhuman, (double) blockposition.getX(), (double) blockposition.getY(), (double) blockposition.getZ(), 64.0D, this.world.dimension, new PacketPlayOutWorldEvent(i, blockposition, j, false));
     }
 
     public void a(int i, BlockPosition blockposition, int j) {
@@ -59,6 +61,12 @@
     public void b(int i, BlockPosition blockposition, int j) {
         Iterator iterator = this.a.getPlayerList().v().iterator();
 
+        // CraftBukkit start
+        EntityHuman entityhuman = null;
+        Entity entity = world.getEntity(i);
+        if (entity instanceof EntityHuman) entityhuman = (EntityHuman) entity;
+        // CraftBukkit end
+
         while (iterator.hasNext()) {
             EntityPlayer entityplayer = (EntityPlayer) iterator.next();
 
@@ -67,6 +75,12 @@
                 double d1 = (double) blockposition.getY() - entityplayer.locY;
                 double d2 = (double) blockposition.getZ() - entityplayer.locZ;
 
+                // CraftBukkit start
+                if (entityhuman != null && entityhuman instanceof EntityPlayer && !entityplayer.getBukkitEntity().canSee(((EntityPlayer) entityhuman).getBukkitEntity())) {
+                    continue;
+                }
+                // CraftBukkit end
+
                 if (d0 * d0 + d1 * d1 + d2 * d2 < 1024.0D) {
                     entityplayer.playerConnection.sendPacket(new PacketPlayOutBlockBreakAnimation(i, blockposition, j));
                 }