.

BauSystem/BauSystem_Main/build.gradle.kts

@@ -18,8 +18,8 @@
  */
 
 plugins {
-    widener
     steamwar.kotlin
+    widener
 }
 
 tasks.compileJava {

BauSystem/BauSystem_Main/src/de/steamwar/bausystem/features/cannonCore/CannonCoreWand.kt

@@ -52,7 +52,7 @@ object CannonCoreWand: Listener {
     fun onPlayerEquip(event: PlayerItemHeldEvent) {
         val player = event.player
         val swPlayer = SWPlayer.of(event.player)
-        val item = swPlayer.inventory.itemInMainHand
+        val item = player.inventory.getItem(event.newSlot) ?: return
 
         if(!isWandItem(item)) {
             swPlayer.removeComponent(EmptyCannonCoreWandDisplay::class.java)

BauSystem/build.gradle.kts

@@ -38,4 +38,5 @@ tasks.register<DevServer>("DevBau21") {
     dependsOn(":BauSystem:shadowJar")
     dependsOn(":SchematicSystem:shadowJar")
     template = "Bau21"
+    debug = true
 }