craftbukkit/nms-patches/net/minecraft/world/inventory/ContainerShulkerBox.patch

--- a/net/minecraft/world/inventory/ContainerShulkerBox.java
+++ b/net/minecraft/world/inventory/ContainerShulkerBox.java
@@ -6,10 +6,34 @@
 import net.minecraft.world.entity.player.PlayerInventory;
 import net.minecraft.world.item.ItemStack;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.inventory.CraftInventory;
+import org.bukkit.craftbukkit.inventory.CraftInventoryView;
+// CraftBukkit end
+
 public class ContainerShulkerBox extends Container {
 
     private static final int CONTAINER_SIZE = 27;
     private final IInventory container;
+    // CraftBukkit start
+    private CraftInventoryView bukkitEntity;
+    private PlayerInventory player;
+
+    @Override
+    public CraftInventoryView getBukkitView() {
+        if (bukkitEntity != null) {
+            return bukkitEntity;
+        }
+
+        bukkitEntity = new CraftInventoryView(this.player.player.getBukkitEntity(), new CraftInventory(this.container), this);
+        return bukkitEntity;
+    }
+
+    @Override
+    public void startOpen() {
+        container.startOpen(player.player);
+    }
+    // CraftBukkit end
 
     public ContainerShulkerBox(int i, PlayerInventory playerinventory) {
         this(i, playerinventory, new InventorySubcontainer(27));
@@ -19,7 +43,8 @@
         super(Containers.SHULKER_BOX, i);
         checkContainerSize(iinventory, 27);
         this.container = iinventory;
-        iinventory.startOpen(playerinventory.player);
+        this.player = playerinventory; // CraftBukkit - save player
+        // iinventory.startOpen(playerinventory.player); // CraftBukkit - don't startOpen until menu actually opens
         boolean flag = true;
         boolean flag1 = true;
 
@@ -34,6 +59,7 @@
 
     @Override
     public boolean stillValid(EntityHuman entityhuman) {
+        if (!this.checkReachable) return true; // CraftBukkit
         return this.container.stillValid(entityhuman);
     }