Fixes controller item model. Apparently item models dont like using a multipart blockstate file.

src/main/java/appeng/core/api/definitions/ApiBlocks.java

@@ -277,6 +277,7 @@ public final class ApiBlocks implements IBlocks
 		this.spatialIOPort = registry.block( "spatial_ioport", BlockSpatialIOPort::new ).features( AEFeature.SpatialIO ).build();
 		this.controller = registry.block( "controller", BlockController::new )
 				.features( AEFeature.Channels )
+				.useCustomItemModel()
 				.rendering( new ControllerRendering() )
 				.build();
 		this.drive = registry.block( "drive", BlockDrive::new )

src/main/resources/assets/appliedenergistics2/models/item/controller.json

@@ -0,0 +1,3 @@
+{
+  "parent": "appliedenergistics2:block/controller/controller_block_offline"
+}