Some additional fixes from other branch.

src/main/java/appeng/items/contents/CellConfig.java

@@ -22,7 +22,6 @@ package appeng.items.contents;
 import net.minecraft.item.ItemStack;
 
 import appeng.tile.inventory.AppEngInternalInventory;
-import appeng.util.Platform;
 
 
 public class CellConfig extends AppEngInternalInventory
@@ -34,12 +33,12 @@ public class CellConfig extends AppEngInternalInventory
 	{
 		super( null, 63 );
 		this.is = is;
-		this.readFromNBT( Platform.openNbtData( is ), "list" );
+        this.readFromNBT(is.getOrCreateTag(), "list" );
 	}
 
 	@Override
 	protected void onContentsChanged( int slot )
 	{
-		this.writeToNBT( Platform.openNbtData( this.is ), "list" );
+        this.writeToNBT(this.is.getOrCreateTag(), "list" );
 	}
 }

src/main/java/appeng/items/contents/CellUpgrades.java

@@ -22,7 +22,6 @@ package appeng.items.contents;
 import net.minecraft.item.ItemStack;
 
 import appeng.parts.automation.StackUpgradeInventory;
-import appeng.util.Platform;
 
 
 public final class CellUpgrades extends StackUpgradeInventory
@@ -33,12 +32,12 @@ public final class CellUpgrades extends StackUpgradeInventory
 	{
 		super( is, null, upgrades );
 		this.is = is;
-		this.readFromNBT( Platform.openNbtData( is ), "upgrades" );
+        this.readFromNBT(is.getOrCreateTag(), "upgrades" );
 	}
 
 	@Override
 	protected void onContentsChanged( int slot )
 	{
-		this.writeToNBT( Platform.openNbtData( this.is ), "upgrades" );
+        this.writeToNBT(this.is.getOrCreateTag(), "upgrades" );
 	}
 }

src/main/java/appeng/items/contents/NetworkToolViewer.java

@@ -26,7 +26,6 @@ import appeng.api.implementations.guiobjects.INetworkTool;
 import appeng.api.implementations.items.IUpgradeModule;
 import appeng.api.networking.IGridHost;
 import appeng.tile.inventory.AppEngInternalInventory;
-import appeng.util.Platform;
 import appeng.util.inv.IAEAppEngInventory;
 import appeng.util.inv.InvOperation;
 import appeng.util.inv.filter.IAEItemFilter;
@@ -45,16 +44,16 @@ public class NetworkToolViewer implements INetworkTool, IAEAppEngInventory
 		this.gh = gHost;
 		this.inv = new AppEngInternalInventory( this, 9 );
 		this.inv.setFilter( new NetworkToolInventoryFilter() );
-		if( is.hasTagCompound() ) // prevent crash when opening network status screen.
+		if( is.hasTag() ) // prevent crash when opening network status screen.
 		{
-			this.inv.readFromNBT( Platform.openNbtData( is ), "inv" );
+            this.inv.readFromNBT(is.getOrCreateTag(), "inv" );
 		}
 	}
 
 	@Override
 	public void saveChanges()
 	{
-		this.inv.writeToNBT( Platform.openNbtData( this.is ), "inv" );
+        this.inv.writeToNBT(this.is.getOrCreateTag(), "inv" );
 	}
 
 	@Override

src/main/java/appeng/items/contents/PortableCellViewer.java

@@ -40,7 +40,6 @@ import appeng.api.util.IConfigManager;
 import appeng.container.interfaces.IInventorySlotAware;
 import appeng.me.helpers.MEMonitorHandler;
 import appeng.util.ConfigManager;
-import appeng.util.Platform;
 
 
 public class PortableCellViewer extends MEMonitorHandler<IAEItemStack> implements IPortableCell, IInventorySlotAware
@@ -98,7 +97,7 @@ public class PortableCellViewer extends MEMonitorHandler<IAEItemStack> implement
 	{
 		final ConfigManager out = new ConfigManager( ( manager, settingName, newValue ) ->
 		{
-			final CompoundNBT data = Platform.openNbtData( PortableCellViewer.this.target );
+            final CompoundNBT data = this.target.getOrCreateTag();
 			manager.writeToNBT( data );
 		} );
 
@@ -106,7 +105,7 @@ public class PortableCellViewer extends MEMonitorHandler<IAEItemStack> implement
 		out.registerSetting( Settings.VIEW_MODE, ViewItems.ALL );
 		out.registerSetting( Settings.SORT_DIRECTION, SortDir.ASCENDING );
 
-		out.readFromNBT( Platform.openNbtData( this.target ).copy() );
+        out.readFromNBT( this.target.getOrCreateTag().copy() );
 		return out;
 	}
 }